Merge remote-tracking branch 'upstream/dev/3.0.0' into updatev2

* Expose suggestions API

* Improve javadoc of suggestions api

api/src/main/java/com/velocitypowered/api/command/CommandManager.java

@@ -7,8 +7,10 @@
 
 package com.velocitypowered.api.command;
 
+import com.mojang.brigadier.suggestion.Suggestions;
 import com.velocitypowered.api.event.command.CommandExecuteEvent;
 import java.util.Collection;
+import java.util.List;
 import java.util.concurrent.CompletableFuture;
 import java.util.function.Predicate;
 import org.checkerframework.checker.nullness.qual.Nullable;
@@ -116,6 +118,27 @@ public interface CommandManager {
    */
   CompletableFuture<Boolean> executeImmediatelyAsync(CommandSource source, String cmdLine);
 
+  /**
+   * Asynchronously collects suggestions to fill in the given command {@code cmdLine}.
+   * Returns only the raw completion suggestions without tooltips.
+   *
+   * @param source  the source to execute the command for
+   * @param cmdLine the partially completed command
+   * @return a {@link CompletableFuture} eventually completed with a {@link List}, possibly empty
+   */
+  CompletableFuture<List<String>> offerSuggestions(CommandSource source, String cmdLine);
+
+  /**
+   * Asynchronously collects suggestions to fill in the given command {@code cmdLine}.
+   * Returns the brigadier {@link Suggestions} with tooltips for each result.
+   *
+   * @param source  the source to execute the command for
+   * @param cmdLine the partially completed command
+   * @return a {@link CompletableFuture} eventually completed with {@link Suggestions}, possibly
+   *         empty
+   */
+  CompletableFuture<Suggestions> offerBrigadierSuggestions(CommandSource source, String cmdLine);
+
   /**
    * Returns an immutable collection of the case-insensitive aliases registered
    * on this manager.

api/src/main/java/com/velocitypowered/api/network/ProtocolVersion.java

@@ -90,7 +90,8 @@ public enum ProtocolVersion implements Ordered<ProtocolVersion> {
   MINECRAFT_1_21(767, "1.21", "1.21.1"),
   MINECRAFT_1_21_2(768, "1.21.2", "1.21.3"),
   MINECRAFT_1_21_4(769, "1.21.4"),
-  MINECRAFT_1_21_5(770, /*1073742067,*/ "1.21.5");
+  MINECRAFT_1_21_5(770, "1.21.5"),
+  MINECRAFT_1_21_6(771, "1.21.6");
 
   private static final int SNAPSHOT_BIT = 30;
 

gradle/libs.versions.toml

@@ -2,8 +2,8 @@
 configurate3 = "3.7.3"
 configurate4 = "4.1.2"
 flare = "2.0.1"
-log4j = "2.24.1"
-netty = "4.2.0.Final"
+log4j = "2.24.3"
+netty = "4.2.1.Final"
 
 [plugins]
 indra-publishing = "net.kyori.indra.publishing:2.0.6"
@@ -11,10 +11,10 @@ shadow = "io.github.goooler.shadow:8.1.5"
 spotless = "com.diffplug.spotless:6.25.0"
 
 [libraries]
-adventure-bom = "net.kyori:adventure-bom:4.19.0"
-adventure-text-serializer-json-legacy-impl = "net.kyori:adventure-text-serializer-json-legacy-impl:4.19.0"
+adventure-bom = "net.kyori:adventure-bom:4.21.0"
+adventure-text-serializer-json-legacy-impl = "net.kyori:adventure-text-serializer-json-legacy-impl:4.21.0"
 adventure-facet = "net.kyori:adventure-platform-facet:4.3.4"
-asm = "org.ow2.asm:asm:9.7.1"
+asm = "org.ow2.asm:asm:9.8"
 auto-service = "com.google.auto.service:auto-service:1.0.1"
 auto-service-annotations = "com.google.auto.service:auto-service-annotations:1.0.1"
 brigadier = "com.velocitypowered:velocity-brigadier:1.0.0-SNAPSHOT"
@@ -33,7 +33,7 @@ disruptor = "com.lmax:disruptor:4.0.0"
 fastutil = "it.unimi.dsi:fastutil:8.5.15"
 flare-core = { module = "space.vectrix.flare:flare", version.ref = "flare" }
 flare-fastutil = { module = "space.vectrix.flare:flare-fastutil", version.ref = "flare" }
-jline = "org.jline:jline-terminal-jansi:3.27.1"
+jline = "org.jline:jline-terminal-jansi:3.30.2"
 jopt = "net.sf.jopt-simple:jopt-simple:5.0.4"
 junit = "org.junit.jupiter:junit-jupiter:5.10.2"
 jspecify = "org.jspecify:jspecify:0.3.0"
@@ -56,7 +56,7 @@ netty-transport-native-epoll = { module = "io.netty:netty-transport-native-epoll
 netty-transport-native-kqueue = { module = "io.netty:netty-transport-native-kqueue", version.ref = "netty" }
 netty-transport-native-iouring = { module = "io.netty:netty-transport-native-io_uring", version.ref = "netty" }
 nightconfig = "com.electronwill.night-config:toml:3.6.7"
-slf4j = "org.slf4j:slf4j-api:2.0.12"
+slf4j = "org.slf4j:slf4j-api:2.0.17"
 snakeyaml = "org.yaml:snakeyaml:1.33"
 spotbugs-annotations = "com.github.spotbugs:spotbugs-annotations:4.7.3"
 terminalconsoleappender = "net.minecrell:terminalconsoleappender:1.3.0"

proxy/build.gradle.kts

@@ -100,6 +100,7 @@ tasks {
     runShadow {
         workingDir = file("run").also(File::mkdirs)
         standardInput = System.`in`
+        jvmArgs("-Dvelocity.packet-decode-logging=true")
     }
     named<JavaExec>("run") {
         workingDir = file("run").also(File::mkdirs)

proxy/src/main/java/com/velocitypowered/proxy/Velocity.java

@@ -47,6 +47,11 @@ public class Velocity {
       System.setProperty("io.netty.native.workdir", System.getProperty("velocity.natives-tmpdir"));
     }
 
+    // Restore allocator used before Netty 4.2 due to oom issues with the adaptive allocator
+    if (System.getProperty("io.netty.allocator.type") == null) {
+      System.setProperty("io.netty.allocator.type", "pooled");
+    }
+
     // Disable the resource leak detector by default as it reduces performance. Allow the user to
     // override this if desired.
     if (!VelocityProperties.hasProperty("io.netty.leakDetection.level")) {

proxy/src/main/java/com/velocitypowered/proxy/VelocityServer.java

@@ -81,6 +81,7 @@ import java.net.http.HttpClient;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.security.KeyPair;
+import java.text.MessageFormat;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
@@ -104,7 +105,7 @@ import net.kyori.adventure.audience.ForwardingAudience;
 import net.kyori.adventure.key.Key;
 import net.kyori.adventure.text.Component;
 import net.kyori.adventure.translation.GlobalTranslator;
-import net.kyori.adventure.translation.TranslationRegistry;
+import net.kyori.adventure.translation.TranslationStore;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 import org.bstats.MetricsBase;
@@ -337,8 +338,8 @@ public class VelocityServer implements ProxyServer, ForwardingAudience {
   }
 
   private void registerTranslations() {
-    final TranslationRegistry translationRegistry = TranslationRegistry
-        .create(Key.key("velocity", "translations"));
+    final TranslationStore.StringBased<MessageFormat> translationRegistry =
+            TranslationStore.messageFormat(Key.key("velocity", "translations"));
     translationRegistry.defaultLocale(Locale.US);
     try {
       ResourceUtils.visitResources(VelocityServer.class, path -> {

proxy/src/main/java/com/velocitypowered/proxy/command/VelocityCommandManager.java

@@ -300,27 +300,14 @@ public class VelocityCommandManager implements CommandManager {
     );
   }
 
-  /**
-   * Returns suggestions to fill in the given command.
-   *
-   * @param source  the source to execute the command for
-   * @param cmdLine the partially completed command
-   * @return a {@link CompletableFuture} eventually completed with a {@link List}, possibly empty
-   */
+  @Override
   public CompletableFuture<List<String>> offerSuggestions(final CommandSource source,
       final String cmdLine) {
     return offerBrigadierSuggestions(source, cmdLine)
         .thenApply(suggestions -> Lists.transform(suggestions.getList(), Suggestion::getText));
   }
 
-  /**
-   * Returns suggestions to fill in the given command.
-   *
-   * @param source  the source to execute the command for
-   * @param cmdLine the partially completed command
-   * @return a {@link CompletableFuture} eventually completed with {@link Suggestions}, possibly
-   *         empty
-   */
+  @Override
   public CompletableFuture<Suggestions> offerBrigadierSuggestions(
       final CommandSource source, final String cmdLine) {
     Preconditions.checkNotNull(source, "source");

proxy/src/main/java/com/velocitypowered/proxy/connection/MinecraftConnection.java

@@ -46,6 +46,7 @@ import com.velocitypowered.proxy.protocol.netty.MinecraftCompressDecoder;
 import com.velocitypowered.proxy.protocol.netty.MinecraftCompressorAndLengthEncoder;
 import com.velocitypowered.proxy.protocol.netty.MinecraftDecoder;
 import com.velocitypowered.proxy.protocol.netty.MinecraftEncoder;
+import com.velocitypowered.proxy.protocol.netty.MinecraftVarintFrameDecoder;
 import com.velocitypowered.proxy.protocol.netty.MinecraftVarintLengthEncoder;
 import com.velocitypowered.proxy.protocol.netty.PlayPacketQueueInboundHandler;
 import com.velocitypowered.proxy.protocol.netty.PlayPacketQueueOutboundHandler;
@@ -368,6 +369,11 @@ public class MinecraftConnection extends ChannelInboundHandlerAdapter {
     ensureInEventLoop();
 
     this.state = state;
+    final MinecraftVarintFrameDecoder frameDecoder = this.channel.pipeline()
+        .get(MinecraftVarintFrameDecoder.class);
+    if (frameDecoder != null) {
+      frameDecoder.setState(state);
+    }
     // If the connection is LEGACY (<1.6), the decoder and encoder are not set.
     final MinecraftEncoder minecraftEncoder = this.channel.pipeline()
         .get(MinecraftEncoder.class);

proxy/src/main/java/com/velocitypowered/proxy/connection/backend/BackendPlaySessionHandler.java

@@ -47,6 +47,7 @@ import com.velocitypowered.proxy.connection.util.ConnectionMessages;
 import com.velocitypowered.proxy.protocol.MinecraftPacket;
 import com.velocitypowered.proxy.protocol.StateRegistry;
 import com.velocitypowered.proxy.protocol.netty.MinecraftDecoder;
+import com.velocitypowered.proxy.protocol.netty.MinecraftVarintFrameDecoder;
 import com.velocitypowered.proxy.protocol.packet.AvailableCommandsPacket;
 import com.velocitypowered.proxy.protocol.packet.BossBarPacket;
 import com.velocitypowered.proxy.protocol.packet.BundleDelimiterPacket;
@@ -149,6 +150,7 @@ public class BackendPlaySessionHandler implements MinecraftSessionHandler {
     MinecraftConnection smc = serverConn.ensureConnected();
     smc.setAutoReading(false);
     // Even when not auto reading messages are still decoded. Decode them with the correct state
+    smc.getChannel().pipeline().get(MinecraftVarintFrameDecoder.class).setState(StateRegistry.CONFIG);
     smc.getChannel().pipeline().get(MinecraftDecoder.class).setState(StateRegistry.CONFIG);
     serverConn.getPlayer().switchToConfigState();
     return true;

proxy/src/main/java/com/velocitypowered/proxy/connection/backend/ConfigSessionHandler.java

@@ -40,6 +40,7 @@ import com.velocitypowered.proxy.connection.util.ConnectionRequestResults.Impl;
 import com.velocitypowered.proxy.protocol.MinecraftPacket;
 import com.velocitypowered.proxy.protocol.StateRegistry;
 import com.velocitypowered.proxy.protocol.netty.MinecraftDecoder;
+import com.velocitypowered.proxy.protocol.netty.MinecraftVarintFrameDecoder;
 import com.velocitypowered.proxy.protocol.packet.ClientboundCookieRequestPacket;
 import com.velocitypowered.proxy.protocol.packet.ClientboundStoreCookiePacket;
 import com.velocitypowered.proxy.protocol.packet.DisconnectPacket;
@@ -232,6 +233,7 @@ public class ConfigSessionHandler implements MinecraftSessionHandler {
     final ConnectedPlayer player = serverConn.getPlayer();
     final ClientConfigSessionHandler configHandler = (ClientConfigSessionHandler) player.getConnection().getActiveSessionHandler();
 
+    smc.getChannel().pipeline().get(MinecraftVarintFrameDecoder.class).setState(StateRegistry.PLAY);
     smc.getChannel().pipeline().get(MinecraftDecoder.class).setState(StateRegistry.PLAY);
     //noinspection DataFlowIssue
     configHandler.handleBackendFinishUpdate(serverConn).thenRunAsync(() -> {

proxy/src/main/java/com/velocitypowered/proxy/connection/client/ClientConfigSessionHandler.java

@@ -170,7 +170,11 @@ public class ClientConfigSessionHandler implements MinecraftSessionHandler {
   @Override
   public boolean handle(KnownPacksPacket packet) {
     callConfigurationEvent().thenRun(() -> {
-      player.getConnectionInFlightOrConnectedServer().ensureConnected().write(packet);
+      VelocityServerConnection targetServer =
+          player.getConnectionInFlightOrConnectedServer();
+      if (targetServer != null) {
+        targetServer.ensureConnected().write(packet);
+      }
     }).exceptionally(ex -> {
       logger.error("Error forwarding known packs response to backend:", ex);
       return null;

proxy/src/main/java/com/velocitypowered/proxy/connection/client/ConnectedPlayer.java

@@ -123,6 +123,7 @@ import net.kyori.adventure.permission.PermissionChecker;
 import net.kyori.adventure.platform.facet.FacetPointers;
 import net.kyori.adventure.platform.facet.FacetPointers.Type;
 import net.kyori.adventure.pointer.Pointers;
+import net.kyori.adventure.pointer.PointersSupplier;
 import net.kyori.adventure.resource.ResourcePackInfoLike;
 import net.kyori.adventure.resource.ResourcePackRequest;
 import net.kyori.adventure.resource.ResourcePackRequestLike;
@@ -145,14 +146,23 @@ import org.jetbrains.annotations.NotNull;
 public class ConnectedPlayer implements MinecraftConnectionAssociation, Player, KeyIdentifiable,
     VelocityInboundConnection {
 
-  public static final int MAX_CLIENTSIDE_PLUGIN_CHANNELS = 1024;
+  public static final int MAX_CLIENTSIDE_PLUGIN_CHANNELS = Integer.getInteger("velocity.max-clientside-plugin-channels", 1024);
   private static final PlainTextComponentSerializer PASS_THRU_TRANSLATE =
       PlainTextComponentSerializer.builder().flattener(TranslatableMapper.FLATTENER).build();
   static final PermissionProvider DEFAULT_PERMISSIONS = s -> PermissionFunction.ALWAYS_UNDEFINED;
 
   private static final ComponentLogger logger = ComponentLogger.logger(ConnectedPlayer.class);
 
-  private final Identity identity = new IdentityImpl();
+  private static final @NotNull PointersSupplier<ConnectedPlayer> POINTERS_SUPPLIER =
+          PointersSupplier.<ConnectedPlayer>builder()
+                  .resolving(Identity.UUID, Player::getUniqueId)
+                  .resolving(Identity.NAME, Player::getUsername)
+                  .resolving(Identity.DISPLAY_NAME, player -> Component.text(player.getUsername()))
+                  .resolving(Identity.LOCALE, Player::getEffectiveLocale)
+                  .resolving(PermissionChecker.POINTER, Player::getPermissionChecker)
+                  .resolving(FacetPointers.TYPE, player -> Type.PLAYER)
+                  .build();
+
   /**
    * The actual Minecraft connection. This is actually a wrapper object around the Netty channel.
    */
@@ -181,14 +191,6 @@ public class ConnectedPlayer implements MinecraftConnectionAssociation, Player,
   private final ResourcePackHandler resourcePackHandler;
   private final BundleDelimiterHandler bundleHandler = new BundleDelimiterHandler(this);
 
-  private final @NotNull Pointers pointers =
-      Player.super.pointers().toBuilder()
-          .withDynamic(Identity.UUID, this::getUniqueId)
-          .withDynamic(Identity.NAME, this::getUsername)
-          .withDynamic(Identity.DISPLAY_NAME, () -> Component.text(this.getUsername()))
-          .withDynamic(Identity.LOCALE, this::getEffectiveLocale)
-          .withStatic(PermissionChecker.POINTER, getPermissionChecker())
-          .withStatic(FacetPointers.TYPE, Type.PLAYER).build();
   private @Nullable String clientBrand;
   private @Nullable Locale effectiveLocale;
   private final @Nullable IdentifiedKey playerKey;
@@ -257,7 +259,7 @@ public class ConnectedPlayer implements MinecraftConnectionAssociation, Player,
 
   @Override
   public @NonNull Identity identity() {
-    return this.identity;
+    return Identity.identity(this.getUniqueId());
   }
 
   @Override
@@ -363,7 +365,7 @@ public class ConnectedPlayer implements MinecraftConnectionAssociation, Player,
 
   @Override
   public @NotNull Pointers pointers() {
-    return this.pointers;
+    return POINTERS_SUPPLIER.view(this);
   }
 
   @Override
@@ -396,14 +398,20 @@ public class ConnectedPlayer implements MinecraftConnectionAssociation, Player,
   }
 
   /**
-   * Translates the message in the user's locale.
+   * Translates the message in the user's locale, falling back to the default locale if not set.
    *
    * @param message the message to translate
    * @return the translated message
    */
   public Component translateMessage(Component message) {
-    Locale locale = ClosestLocaleMatcher.INSTANCE
-        .lookupClosest(getEffectiveLocale() == null ? Locale.getDefault() : getEffectiveLocale());
+    Locale locale = this.getEffectiveLocale();
+    if (locale == null && settings != null) {
+      locale = settings.getLocale();
+    }
+    if (locale == null) {
+      locale = Locale.getDefault();
+    }
+    locale = ClosestLocaleMatcher.INSTANCE.lookupClosest(locale);
     return GlobalTranslator.render(message, locale);
   }
 
@@ -1361,14 +1369,6 @@ public class ConnectedPlayer implements MinecraftConnectionAssociation, Player,
     return playerKey;
   }
 
-  private class IdentityImpl implements Identity {
-
-    @Override
-    public @NonNull UUID uuid() {
-      return ConnectedPlayer.this.getUniqueId();
-    }
-  }
-
   @Override
   public ProtocolState getProtocolState() {
     return connection.getState().toProtocolState();

proxy/src/main/java/com/velocitypowered/proxy/network/BackendChannelInitializer.java

@@ -51,7 +51,7 @@ public class BackendChannelInitializer extends ChannelInitializer<Channel> {
   @Override
   protected void initChannel(Channel ch) {
     ch.pipeline()
-        .addLast(FRAME_DECODER, new MinecraftVarintFrameDecoder())
+        .addLast(FRAME_DECODER, new MinecraftVarintFrameDecoder(ProtocolUtils.Direction.CLIENTBOUND))
         .addLast(READ_TIMEOUT,
             new ReadTimeoutHandler(server.getConfiguration().getReadTimeout(),
                 TimeUnit.MILLISECONDS))

proxy/src/main/java/com/velocitypowered/proxy/network/ServerChannelInitializer.java

@@ -58,7 +58,7 @@ public class ServerChannelInitializer extends ChannelInitializer<Channel> {
   protected void initChannel(final Channel ch) {
     ch.pipeline()
         .addLast(LEGACY_PING_DECODER, new LegacyPingDecoder())
-        .addLast(FRAME_DECODER, new MinecraftVarintFrameDecoder())
+        .addLast(FRAME_DECODER, new MinecraftVarintFrameDecoder(ProtocolUtils.Direction.SERVERBOUND))
         .addLast(READ_TIMEOUT,
             new ReadTimeoutHandler(this.server.getConfiguration().getReadTimeout(),
                 TimeUnit.MILLISECONDS))

proxy/src/main/java/com/velocitypowered/proxy/network/TransportType.java

@@ -116,7 +116,7 @@ public enum TransportType {
       return NIO;
     }
 
-    if (IoUring.isAvailable() && Boolean.getBoolean("velocity.enable-iouring-transport")) {
+    if (IoUring.isAvailable() && !Boolean.getBoolean("velocity.disable-iouring-transport")) {
       return IO_URING;
     }
 

proxy/src/main/java/com/velocitypowered/proxy/protocol/ProtocolUtils.java

@@ -47,7 +47,7 @@ import net.kyori.adventure.nbt.CompoundBinaryTag;
 import net.kyori.adventure.text.serializer.gson.GsonComponentSerializer;
 import net.kyori.adventure.text.serializer.json.JSONOptions;
 import net.kyori.adventure.text.serializer.json.legacyimpl.NBTLegacyHoverEventSerializer;
-import net.kyori.option.OptionState;
+import net.kyori.option.OptionSchema;
 
 /**
  * Utilities for writing and reading data in the Minecraft protocol.
@@ -60,10 +60,11 @@ public enum ProtocolUtils {
           .downsampleColors()
           .legacyHoverEventSerializer(NBTLegacyHoverEventSerializer.get())
           .options(
-              OptionState.optionState()
+              OptionSchema.globalSchema().stateBuilder()
               // before 1.16
               .value(JSONOptions.EMIT_RGB, Boolean.FALSE)
-              .value(JSONOptions.EMIT_HOVER_EVENT_TYPE, JSONOptions.HoverEventValueMode.LEGACY_ONLY)
+              .value(JSONOptions.EMIT_HOVER_EVENT_TYPE, JSONOptions.HoverEventValueMode.VALUE_FIELD)
+              .value(JSONOptions.EMIT_CLICK_EVENT_TYPE, JSONOptions.ClickEventValueMode.CAMEL_CASE)
               // before 1.20.3
               .value(JSONOptions.EMIT_COMPACT_TEXT_COMPONENT, Boolean.FALSE)
               .value(JSONOptions.EMIT_HOVER_SHOW_ENTITY_ID_AS_INT_ARRAY, Boolean.FALSE)
@@ -75,10 +76,12 @@ public enum ProtocolUtils {
           GsonComponentSerializer.builder()
           .legacyHoverEventSerializer(NBTLegacyHoverEventSerializer.get())
           .options(
-              OptionState.optionState()
+              OptionSchema.globalSchema().stateBuilder()
               // after 1.16
               .value(JSONOptions.EMIT_RGB, Boolean.TRUE)
-              .value(JSONOptions.EMIT_HOVER_EVENT_TYPE, JSONOptions.HoverEventValueMode.MODERN_ONLY)
+              .value(JSONOptions.EMIT_HOVER_EVENT_TYPE, JSONOptions.HoverEventValueMode.CAMEL_CASE)
+              .value(JSONOptions.EMIT_CLICK_EVENT_TYPE, JSONOptions.ClickEventValueMode.CAMEL_CASE)
+              .value(JSONOptions.EMIT_HOVER_SHOW_ENTITY_KEY_AS_TYPE_AND_UUID_AS_ID, true)
               // before 1.20.3
               .value(JSONOptions.EMIT_COMPACT_TEXT_COMPONENT, Boolean.FALSE)
               .value(JSONOptions.EMIT_HOVER_SHOW_ENTITY_ID_AS_INT_ARRAY, Boolean.FALSE)
@@ -86,17 +89,37 @@ public enum ProtocolUtils {
               .build()
           )
           .build();
+  private static final GsonComponentSerializer PRE_1_21_5_SERIALIZER =
+      GsonComponentSerializer.builder()
+          .legacyHoverEventSerializer(NBTLegacyHoverEventSerializer.get())
+          .options(
+              OptionSchema.globalSchema().stateBuilder()
+              // after 1.16
+              .value(JSONOptions.EMIT_RGB, Boolean.TRUE)
+              .value(JSONOptions.EMIT_HOVER_EVENT_TYPE, JSONOptions.HoverEventValueMode.CAMEL_CASE)
+              .value(JSONOptions.EMIT_CLICK_EVENT_TYPE, JSONOptions.ClickEventValueMode.CAMEL_CASE)
+              .value(JSONOptions.EMIT_HOVER_SHOW_ENTITY_KEY_AS_TYPE_AND_UUID_AS_ID, true)
+              // after 1.20.3
+              .value(JSONOptions.EMIT_COMPACT_TEXT_COMPONENT, Boolean.TRUE)
+              .value(JSONOptions.EMIT_HOVER_SHOW_ENTITY_ID_AS_INT_ARRAY, Boolean.TRUE)
+              .value(JSONOptions.VALIDATE_STRICT_EVENTS, Boolean.TRUE)
+              .build()
+          )
+          .build();
   private static final GsonComponentSerializer MODERN_SERIALIZER =
       GsonComponentSerializer.builder()
           .legacyHoverEventSerializer(NBTLegacyHoverEventSerializer.get())
           .options(
-              OptionState.optionState()
+              OptionSchema.globalSchema().stateBuilder()
               // after 1.16
               .value(JSONOptions.EMIT_RGB, Boolean.TRUE)
-              .value(JSONOptions.EMIT_HOVER_EVENT_TYPE, JSONOptions.HoverEventValueMode.MODERN_ONLY)
+              .value(JSONOptions.EMIT_HOVER_EVENT_TYPE, JSONOptions.HoverEventValueMode.SNAKE_CASE)
+              .value(JSONOptions.EMIT_CLICK_EVENT_TYPE, JSONOptions.ClickEventValueMode.SNAKE_CASE)
               // after 1.20.3
               .value(JSONOptions.EMIT_COMPACT_TEXT_COMPONENT, Boolean.TRUE)
               .value(JSONOptions.EMIT_HOVER_SHOW_ENTITY_ID_AS_INT_ARRAY, Boolean.TRUE)
+              // after 1.21.5
+              .value(JSONOptions.EMIT_HOVER_SHOW_ENTITY_KEY_AS_TYPE_AND_UUID_AS_ID, Boolean.FALSE)
               .value(JSONOptions.VALIDATE_STRICT_EVENTS, Boolean.TRUE)
               .build()
           )
@@ -713,9 +736,12 @@ public enum ProtocolUtils {
    * @return the appropriate {@link GsonComponentSerializer}
    */
   public static GsonComponentSerializer getJsonChatSerializer(ProtocolVersion version) {
-    if (version.noLessThan(ProtocolVersion.MINECRAFT_1_20_3)) {
+    if (version.noLessThan(ProtocolVersion.MINECRAFT_1_21_5)) {
       return MODERN_SERIALIZER;
     }
+    if (version.noLessThan(ProtocolVersion.MINECRAFT_1_20_3)) {
+      return PRE_1_21_5_SERIALIZER;
+    }
     if (version.noLessThan(ProtocolVersion.MINECRAFT_1_16)) {
       return PRE_1_20_3_SERIALIZER;
     }

proxy/src/main/java/com/velocitypowered/proxy/protocol/StateRegistry.java

@@ -40,6 +40,7 @@ import static com.velocitypowered.api.network.ProtocolVersion.MINECRAFT_1_21;
 import static com.velocitypowered.api.network.ProtocolVersion.MINECRAFT_1_21_2;
 import static com.velocitypowered.api.network.ProtocolVersion.MINECRAFT_1_21_4;
 import static com.velocitypowered.api.network.ProtocolVersion.MINECRAFT_1_21_5;
+import static com.velocitypowered.api.network.ProtocolVersion.MINECRAFT_1_21_6;
 import static com.velocitypowered.api.network.ProtocolVersion.MINECRAFT_1_7_2;
 import static com.velocitypowered.api.network.ProtocolVersion.MINECRAFT_1_8;
 import static com.velocitypowered.api.network.ProtocolVersion.MINECRAFT_1_9;
@@ -256,7 +257,8 @@ public enum StateRegistry {
           map(0x09, MINECRAFT_1_19_4, false),
           map(0x0A, MINECRAFT_1_20_2, false),
           map(0x0B, MINECRAFT_1_20_5, false),
-          map(0x0D, MINECRAFT_1_21_2, false));
+          map(0x0D, MINECRAFT_1_21_2, false),
+          map(0x0E, MINECRAFT_1_21_6, false));
       serverbound.register(
           LegacyChatPacket.class,
           LegacyChatPacket::new,
@@ -269,7 +271,8 @@ public enum StateRegistry {
           ChatAcknowledgementPacket.class,
           ChatAcknowledgementPacket::new,
           map(0x03, MINECRAFT_1_19_3, false),
-          map(0x04, MINECRAFT_1_21_2, false));
+          map(0x04, MINECRAFT_1_21_2, false),
+          map(0x05, MINECRAFT_1_21_6, false));
       serverbound.register(KeyedPlayerCommandPacket.class, KeyedPlayerCommandPacket::new,
           map(0x03, MINECRAFT_1_19, false),
           map(0x04, MINECRAFT_1_19_1, MINECRAFT_1_19_1, false));
@@ -279,16 +282,19 @@ public enum StateRegistry {
       serverbound.register(SessionPlayerCommandPacket.class, SessionPlayerCommandPacket::new,
           map(0x04, MINECRAFT_1_19_3, false),
           map(0x05, MINECRAFT_1_20_5, false),
-          map(0x06, MINECRAFT_1_21_2, false));
+          map(0x06, MINECRAFT_1_21_2, false),
+          map(0x07, MINECRAFT_1_21_6, false));
       serverbound.register(UnsignedPlayerCommandPacket.class, UnsignedPlayerCommandPacket::new,
           map(0x04, MINECRAFT_1_20_5, false),
-          map(0x05, MINECRAFT_1_21_2, false));
+          map(0x05, MINECRAFT_1_21_2, false),
+          map(0x06, MINECRAFT_1_21_6, false));
       serverbound.register(
           SessionPlayerChatPacket.class,
           SessionPlayerChatPacket::new,
           map(0x05, MINECRAFT_1_19_3, false),
           map(0x06, MINECRAFT_1_20_5, false),
-          map(0x07, MINECRAFT_1_21_2, false));
+          map(0x07, MINECRAFT_1_21_2, false),
+          map(0x08, MINECRAFT_1_21_6, false));
       serverbound.register(
           ClientSettingsPacket.class,
           ClientSettingsPacket::new,
@@ -303,11 +309,13 @@ public enum StateRegistry {
           map(0x08, MINECRAFT_1_19_4, false),
           map(0x09, MINECRAFT_1_20_2, false),
           map(0x0A, MINECRAFT_1_20_5, false),
-          map(0x0C, MINECRAFT_1_21_2, false));
+          map(0x0C, MINECRAFT_1_21_2, false),
+          map(0x0D, MINECRAFT_1_21_6, false));
       serverbound.register(
           ServerboundCookieResponsePacket.class, ServerboundCookieResponsePacket::new,
           map(0x11, MINECRAFT_1_20_5, false),
-          map(0x13, MINECRAFT_1_21_2, false));
+          map(0x13, MINECRAFT_1_21_2, false),
+          map(0x14, MINECRAFT_1_21_6, false));
       serverbound.register(
           PluginMessagePacket.class,
           PluginMessagePacket::new,
@@ -325,7 +333,8 @@ public enum StateRegistry {
           map(0x0F, MINECRAFT_1_20_2, false),
           map(0x10, MINECRAFT_1_20_3, false),
           map(0x12, MINECRAFT_1_20_5, false),
-          map(0x14, MINECRAFT_1_21_2, false));
+          map(0x14, MINECRAFT_1_21_2, false),
+          map(0x15, MINECRAFT_1_21_6, false));
       serverbound.register(
           KeepAlivePacket.class,
           KeepAlivePacket::new,
@@ -344,7 +353,8 @@ public enum StateRegistry {
           map(0x14, MINECRAFT_1_20_2, false),
           map(0x15, MINECRAFT_1_20_3, false),
           map(0x18, MINECRAFT_1_20_5, false),
-          map(0x1A, MINECRAFT_1_21_2, false));
+          map(0x1A, MINECRAFT_1_21_2, false),
+          map(0x1B, MINECRAFT_1_21_6, false));
       serverbound.register(
           ResourcePackResponsePacket.class,
           ResourcePackResponsePacket::new,
@@ -361,12 +371,14 @@ public enum StateRegistry {
           map(0x28, MINECRAFT_1_20_3, false),
           map(0x2B, MINECRAFT_1_20_5, false),
           map(0x2D, MINECRAFT_1_21_2, false),
-          map(0x2F, MINECRAFT_1_21_4, false));
+          map(0x2F, MINECRAFT_1_21_4, false),
+          map(0x30, MINECRAFT_1_21_6, false));
       serverbound.register(
           FinishedUpdatePacket.class, () -> FinishedUpdatePacket.INSTANCE,
           map(0x0B, MINECRAFT_1_20_2, false),
           map(0x0C, MINECRAFT_1_20_5, false),
-          map(0x0E, MINECRAFT_1_21_2, false));
+          map(0x0E, MINECRAFT_1_21_2, false),
+          map(0x0F, MINECRAFT_1_21_6, false));
 
       clientbound.register(
           BossBarPacket.class,

proxy/src/main/java/com/velocitypowered/proxy/protocol/netty/MinecraftCompressDecoder.java

@@ -39,6 +39,7 @@ public class MinecraftCompressDecoder extends MessageToMessageDecoder<ByteBuf> {
   private static final int UNCOMPRESSED_CAP =
       Boolean.getBoolean("velocity.increased-compression-cap")
           ? HARD_MAXIMUM_UNCOMPRESSED_SIZE : VANILLA_MAXIMUM_UNCOMPRESSED_SIZE;
+  private static final boolean SKIP_COMPRESSION_VALIDATION = Boolean.getBoolean("velocity.skip-uncompressed-packet-size-validation");
 
   private int threshold;
   private final VelocityCompressor compressor;
@@ -52,9 +53,11 @@ public class MinecraftCompressDecoder extends MessageToMessageDecoder<ByteBuf> {
   protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
     int claimedUncompressedSize = ProtocolUtils.readVarInt(in);
     if (claimedUncompressedSize == 0) {
-      int actualUncompressedSize = in.readableBytes();
-      checkFrame(actualUncompressedSize < threshold, "Actual uncompressed size %s is greater than"
-              + " threshold %s", actualUncompressedSize, threshold);
+      if (!SKIP_COMPRESSION_VALIDATION) {
+        int actualUncompressedSize = in.readableBytes();
+        checkFrame(actualUncompressedSize < threshold, "Actual uncompressed size %s is greater than"
+            + " threshold %s", actualUncompressedSize, threshold);
+      }
       // This message is not compressed.
       out.add(in.retain());
       return;

proxy/src/main/java/com/velocitypowered/proxy/protocol/netty/MinecraftDecoder.java

@@ -135,7 +135,7 @@ public class MinecraftDecoder extends ChannelInboundHandlerAdapter {
 
   private String getExtraConnectionDetail(int packetId) {
     return "Direction " + direction + " Protocol " + registry.version + " State " + state
-        + " ID " + Integer.toHexString(packetId);
+        + " ID 0x" + Integer.toHexString(packetId);
   }
 
   public void setProtocolVersion(ProtocolVersion protocolVersion) {

proxy/src/main/java/com/velocitypowered/proxy/protocol/netty/MinecraftVarintFrameDecoder.java

@@ -19,21 +19,51 @@ package com.velocitypowered.proxy.protocol.netty;
 
 import static io.netty.util.ByteProcessor.FIND_NON_NUL;
 
+import com.velocitypowered.api.network.ProtocolVersion;
+import com.velocitypowered.proxy.protocol.MinecraftPacket;
+import com.velocitypowered.proxy.protocol.ProtocolUtils;
+import com.velocitypowered.proxy.protocol.StateRegistry;
 import com.velocitypowered.proxy.util.except.QuietDecoderException;
+import com.velocitypowered.proxy.util.except.QuietRuntimeException;
 import io.netty.buffer.ByteBuf;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.handler.codec.ByteToMessageDecoder;
+import io.netty.handler.codec.CorruptedFrameException;
 import java.util.List;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
 
 /**
  * Frames Minecraft server packets which are prefixed by a 21-bit VarInt encoding.
  */
 public class MinecraftVarintFrameDecoder extends ByteToMessageDecoder {
 
+  private static final Logger LOGGER = LogManager.getLogger(MinecraftVarintFrameDecoder.class);
+  private static final QuietRuntimeException FRAME_DECODER_FAILED =
+      new QuietRuntimeException("A packet frame decoder failed. For more information, launch "
+          + "Velocity with -Dvelocity.packet-decode-logging=true to see more.");
   private static final QuietDecoderException BAD_PACKET_LENGTH =
       new QuietDecoderException("Bad packet length");
   private static final QuietDecoderException VARINT_TOO_BIG =
       new QuietDecoderException("VarInt too big");
+  private static final QuietDecoderException UNKNOWN_PACKET =
+      new QuietDecoderException("Unknown packet");
+
+  private final ProtocolUtils.Direction direction;
+  private final StateRegistry.PacketRegistry.ProtocolRegistry registry;
+  private StateRegistry state;
+
+  /**
+   * Creates a new {@code MinecraftVarintFrameDecoder} decoding packets from the specified {@code Direction}.
+   *
+   * @param direction the direction from which we decode from
+   */
+  public MinecraftVarintFrameDecoder(ProtocolUtils.Direction direction) {
+    this.direction = direction;
+    this.registry = StateRegistry.HANDSHAKE.getProtocolRegistry(
+        direction, ProtocolVersion.MINIMUM_VERSION);
+    this.state = StateRegistry.HANDSHAKE;
+  }
 
   @Override
   protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out)
@@ -62,6 +92,43 @@ public class MinecraftVarintFrameDecoder extends ByteToMessageDecoder {
       throw BAD_PACKET_LENGTH;
     }
 
+    if (length > 0) {
+      if (state == StateRegistry.HANDSHAKE && direction == ProtocolUtils.Direction.SERVERBOUND) {
+        StateRegistry.PacketRegistry.ProtocolRegistry registry =
+            state.getProtocolRegistry(direction, ProtocolVersion.MINIMUM_VERSION);
+
+        final int index = in.readerIndex();
+        final int packetId = readRawVarInt21(in);
+        // Index hasn't changed, we've read nothing
+        if (index == in.readerIndex()) {
+          in.resetReaderIndex();
+          return;
+        }
+        final int payloadLength = length - ProtocolUtils.varIntBytes(packetId);
+
+        MinecraftPacket packet = registry.createPacket(packetId);
+
+        // We handle every packet in this phase, if you said something we don't know, something is really wrong
+        if (packet == null) {
+          throw UNKNOWN_PACKET;
+        }
+
+        // We 'technically' have the incoming bytes of a payload here, and so, these can actually parse
+        // the packet if needed, so, we'll take advantage of the existing methods
+        int expectedMinLen = packet.expectedMinLength(in, direction, registry.version);
+        int expectedMaxLen = packet.expectedMaxLength(in, direction, registry.version);
+        if (expectedMaxLen != -1 && payloadLength > expectedMaxLen) {
+          throw handleOverflow(packet, expectedMaxLen, in.readableBytes());
+        }
+        if (payloadLength < expectedMinLen) {
+          throw handleUnderflow(packet, expectedMaxLen, in.readableBytes());
+        }
+
+
+        in.readerIndex(index);
+      }
+    }
+
     // note that zero-length packets are ignored
     if (length > 0) {
       if (in.readableBytes() < length) {
@@ -72,6 +139,16 @@ public class MinecraftVarintFrameDecoder extends ByteToMessageDecoder {
     }
   }
 
+  @Override
+  public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
+    if (MinecraftDecoder.DEBUG) {
+      LOGGER.atWarn()
+          .withThrowable(cause)
+          .log("Exception caught while decoding frame for {}", ctx.channel().remoteAddress());
+    }
+    super.exceptionCaught(ctx, cause);
+  }
+
   /**
    * Reads a VarInt from the buffer of up to 21 bits in size.
    *
@@ -141,4 +218,26 @@ public class MinecraftVarintFrameDecoder extends ByteToMessageDecoder {
     }
     return result | (tmp & 0x7F) << 14;
   }
+
+  private Exception handleOverflow(MinecraftPacket packet, int expected, int actual) {
+    if (MinecraftDecoder.DEBUG) {
+      return new CorruptedFrameException("Packet sent for " + packet.getClass() + " was too "
+          + "big (expected " + expected + " bytes, got " + actual + " bytes)");
+    } else {
+      return FRAME_DECODER_FAILED;
+    }
+  }
+
+  private Exception handleUnderflow(MinecraftPacket packet, int expected, int actual) {
+    if (MinecraftDecoder.DEBUG) {
+      return new CorruptedFrameException("Packet sent for " + packet.getClass() + " was too "
+          + "small (expected " + expected + " bytes, got " + actual + " bytes)");
+    } else {
+      return FRAME_DECODER_FAILED;
+    }
+  }
+
+  public void setState(StateRegistry stateRegistry) {
+    this.state = stateRegistry;
+  }
 }

proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/AvailableCommandsPacket.java

@@ -50,12 +50,14 @@ import java.util.Deque;
 import java.util.Iterator;
 import java.util.Queue;
 import java.util.concurrent.CompletableFuture;
+import java.util.function.Predicate;
 import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
 public class AvailableCommandsPacket implements MinecraftPacket {
 
   private static final Command<CommandSource> PLACEHOLDER_COMMAND = source -> 0;
+  private static final Predicate<CommandSource> PLACEHOLDER_REQUIREMENT = source -> true;
 
   private static final byte NODE_TYPE_ROOT = 0x00;
   private static final byte NODE_TYPE_LITERAL = 0x01;
@@ -65,6 +67,7 @@ public class AvailableCommandsPacket implements MinecraftPacket {
   private static final byte FLAG_EXECUTABLE = 0x04;
   private static final byte FLAG_IS_REDIRECT = 0x08;
   private static final byte FLAG_HAS_SUGGESTIONS = 0x10;
+  private static final byte FLAG_IS_RESTRICTED = 0x20;
 
   private @MonotonicNonNull RootCommandNode<CommandSource> rootNode;
 
@@ -146,6 +149,9 @@ public class AvailableCommandsPacket implements MinecraftPacket {
     if (node.getCommand() != null) {
       flags |= FLAG_EXECUTABLE;
     }
+    if (node.getRequirement() == PLACEHOLDER_REQUIREMENT) {
+      flags |= FLAG_IS_RESTRICTED;
+    }
 
     if (node instanceof LiteralCommandNode<?>) {
       flags |= NODE_TYPE_LITERAL;
@@ -289,6 +295,11 @@ public class AvailableCommandsPacket implements MinecraftPacket {
             args.executes(PLACEHOLDER_COMMAND);
           }
 
+          // If restricted, add empty requirement
+          if ((flags & FLAG_IS_RESTRICTED) != 0) {
+            args.requires(PLACEHOLDER_REQUIREMENT);
+          }
+
           this.built = args.build();
         }
       }

proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/HandshakePacket.java

@@ -106,4 +106,16 @@ public class HandshakePacket implements MinecraftPacket {
   public boolean handle(MinecraftSessionHandler handler) {
     return handler.handle(this);
   }
+
+  @Override
+  public int expectedMinLength(ByteBuf buf, ProtocolUtils.Direction direction,
+                               ProtocolVersion version) {
+    return 7;
+  }
+
+  @Override
+  public int expectedMaxLength(ByteBuf buf, ProtocolUtils.Direction direction,
+                               ProtocolVersion version) {
+    return 9 + (MAXIMUM_HOSTNAME_LENGTH * 3);
+  }
 }

proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/brigadier/ArgumentPropertyRegistry.java

@@ -23,6 +23,7 @@ import static com.velocitypowered.api.network.ProtocolVersion.MINECRAFT_1_19_4;
 import static com.velocitypowered.api.network.ProtocolVersion.MINECRAFT_1_20_3;
 import static com.velocitypowered.api.network.ProtocolVersion.MINECRAFT_1_20_5;
 import static com.velocitypowered.api.network.ProtocolVersion.MINECRAFT_1_21_5;
+import static com.velocitypowered.api.network.ProtocolVersion.MINECRAFT_1_21_6;
 import static com.velocitypowered.proxy.protocol.packet.brigadier.ArgumentIdentifier.id;
 import static com.velocitypowered.proxy.protocol.packet.brigadier.ArgumentIdentifier.mapSet;
 import static com.velocitypowered.proxy.protocol.packet.brigadier.DoubleArgumentPropertySerializer.DOUBLE;
@@ -164,6 +165,7 @@ public class ArgumentPropertyRegistry {
           return i;
         }
       }
+      throw new IllegalArgumentException("Argument type identifier " + id + " unknown.");
     } else {
       String identifier = ProtocolUtils.readString(buf);
       for (ArgumentIdentifier i : byIdentifier.keySet()) {
@@ -207,68 +209,79 @@ public class ArgumentPropertyRegistry {
     empty(id("minecraft:item_stack", mapSet(MINECRAFT_1_19, 14)));
     empty(id("minecraft:item_predicate", mapSet(MINECRAFT_1_19, 15)));
     empty(id("minecraft:color", mapSet(MINECRAFT_1_19, 16)));
-    empty(id("minecraft:component", mapSet(MINECRAFT_1_19, 17)));
-    empty(id("minecraft:style", mapSet(MINECRAFT_1_20_3, 18))); // added 1.20.3
-    empty(id("minecraft:message", mapSet(MINECRAFT_1_20_3, 19), mapSet(MINECRAFT_1_19, 18)));
-    empty(id("minecraft:nbt_compound_tag", mapSet(MINECRAFT_1_20_3, 20), mapSet(MINECRAFT_1_19, 19))); // added in 1.14
-    empty(id("minecraft:nbt_tag", mapSet(MINECRAFT_1_20_3, 21), mapSet(MINECRAFT_1_19, 20))); // added in 1.14
-    empty(id("minecraft:nbt_path", mapSet(MINECRAFT_1_20_3, 22), mapSet(MINECRAFT_1_19, 21)));
-    empty(id("minecraft:objective", mapSet(MINECRAFT_1_20_3, 23), mapSet(MINECRAFT_1_19, 22)));
-    empty(id("minecraft:objective_criteria", mapSet(MINECRAFT_1_20_3, 24), mapSet(MINECRAFT_1_19, 23)));
-    empty(id("minecraft:operation", mapSet(MINECRAFT_1_20_3, 25), mapSet(MINECRAFT_1_19, 24)));
-    empty(id("minecraft:particle", mapSet(MINECRAFT_1_20_3, 26), mapSet(MINECRAFT_1_19, 25)));
-    empty(id("minecraft:angle", mapSet(MINECRAFT_1_20_3, 27), mapSet(MINECRAFT_1_19, 26))); // added in 1.16.2
-    empty(id("minecraft:rotation", mapSet(MINECRAFT_1_20_3, 28), mapSet(MINECRAFT_1_19, 27)));
-    empty(id("minecraft:scoreboard_slot", mapSet(MINECRAFT_1_20_3, 29), mapSet(MINECRAFT_1_19, 28)));
-    empty(id("minecraft:score_holder", mapSet(MINECRAFT_1_20_3, 30), mapSet(MINECRAFT_1_19, 29)), ByteArgumentPropertySerializer.BYTE);
-    empty(id("minecraft:swizzle", mapSet(MINECRAFT_1_20_3, 31), mapSet(MINECRAFT_1_19, 30)));
-    empty(id("minecraft:team", mapSet(MINECRAFT_1_20_3, 32), mapSet(MINECRAFT_1_19, 31)));
-    empty(id("minecraft:item_slot", mapSet(MINECRAFT_1_20_3, 33), mapSet(MINECRAFT_1_19, 32)));
-    empty(id("minecraft:item_slots", mapSet(MINECRAFT_1_20_5, 34))); // added 1.20.5
-    empty(id("minecraft:resource_location", mapSet(MINECRAFT_1_20_5, 35), mapSet(MINECRAFT_1_20_3, 34), mapSet(MINECRAFT_1_19, 33)));
+    empty(id("minecraft:component", mapSet(MINECRAFT_1_21_6, 18), mapSet(MINECRAFT_1_19, 17)));
+    empty(id("minecraft:style", mapSet(MINECRAFT_1_21_6, 19), mapSet(MINECRAFT_1_20_3, 18))); // added 1.20.3
+    empty(id("minecraft:message", mapSet(MINECRAFT_1_21_6, 20), mapSet(MINECRAFT_1_20_3, 19), mapSet(MINECRAFT_1_19, 18)));
+    empty(id("minecraft:nbt_compound_tag", mapSet(MINECRAFT_1_21_6, 21), mapSet(MINECRAFT_1_20_3, 20), mapSet(MINECRAFT_1_19, 19))); // added in 1.14
+    empty(id("minecraft:nbt_tag", mapSet(MINECRAFT_1_21_6, 22), mapSet(MINECRAFT_1_20_3, 21), mapSet(MINECRAFT_1_19, 20))); // added in 1.14
+    empty(id("minecraft:nbt_path", mapSet(MINECRAFT_1_21_6, 23), mapSet(MINECRAFT_1_20_3, 22), mapSet(MINECRAFT_1_19, 21)));
+    empty(id("minecraft:objective", mapSet(MINECRAFT_1_21_6, 24), mapSet(MINECRAFT_1_20_3, 23), mapSet(MINECRAFT_1_19, 22)));
+    empty(id("minecraft:objective_criteria", mapSet(MINECRAFT_1_21_6, 25), mapSet(MINECRAFT_1_20_3, 24), mapSet(MINECRAFT_1_19, 23)));
+    empty(id("minecraft:operation", mapSet(MINECRAFT_1_21_6, 26), mapSet(MINECRAFT_1_20_3, 25), mapSet(MINECRAFT_1_19, 24)));
+    empty(id("minecraft:particle", mapSet(MINECRAFT_1_21_6, 27), mapSet(MINECRAFT_1_20_3, 26), mapSet(MINECRAFT_1_19, 25)));
+    empty(id("minecraft:angle", mapSet(MINECRAFT_1_21_6, 28), mapSet(MINECRAFT_1_20_3, 27), mapSet(MINECRAFT_1_19, 26))); // added in 1.16.2
+    empty(id("minecraft:rotation", mapSet(MINECRAFT_1_21_6, 29), mapSet(MINECRAFT_1_20_3, 28), mapSet(MINECRAFT_1_19, 27)));
+    empty(id("minecraft:scoreboard_slot", mapSet(MINECRAFT_1_21_6, 30), mapSet(MINECRAFT_1_20_3, 29), mapSet(MINECRAFT_1_19, 28)));
+    empty(id("minecraft:score_holder", mapSet(MINECRAFT_1_21_6, 31), mapSet(MINECRAFT_1_20_3, 30), mapSet(MINECRAFT_1_19, 29)),
+        ByteArgumentPropertySerializer.BYTE);
+    empty(id("minecraft:swizzle", mapSet(MINECRAFT_1_21_6, 32), mapSet(MINECRAFT_1_20_3, 31), mapSet(MINECRAFT_1_19, 30)));
+    empty(id("minecraft:team", mapSet(MINECRAFT_1_21_6, 33), mapSet(MINECRAFT_1_20_3, 32), mapSet(MINECRAFT_1_19, 31)));
+    empty(id("minecraft:item_slot", mapSet(MINECRAFT_1_21_6, 34), mapSet(MINECRAFT_1_20_3, 33), mapSet(MINECRAFT_1_19, 32)));
+    empty(id("minecraft:item_slots", mapSet(MINECRAFT_1_21_6, 35), mapSet(MINECRAFT_1_20_5, 34))); // added 1.20.5
+    empty(id("minecraft:resource_location", mapSet(MINECRAFT_1_21_6, 36), mapSet(MINECRAFT_1_20_5, 35), mapSet(MINECRAFT_1_20_3, 34),
+        mapSet(MINECRAFT_1_19, 33)));
     empty(id("minecraft:mob_effect", mapSet(MINECRAFT_1_19_3, -1), mapSet(MINECRAFT_1_19, 34)));
-    empty(id("minecraft:function", mapSet(MINECRAFT_1_20_5, 36), mapSet(MINECRAFT_1_20_3, 35), mapSet(MINECRAFT_1_19_3, 34),
-        mapSet(MINECRAFT_1_19, 35)));
-    empty(id("minecraft:entity_anchor", mapSet(MINECRAFT_1_20_5, 37), mapSet(MINECRAFT_1_20_3, 36), mapSet(MINECRAFT_1_19_3, 35),
-        mapSet(MINECRAFT_1_19, 36)));
-    empty(id("minecraft:int_range", mapSet(MINECRAFT_1_20_5, 38), mapSet(MINECRAFT_1_20_3, 37), mapSet(MINECRAFT_1_19_3, 36),
-        mapSet(MINECRAFT_1_19, 37)));
-    empty(id("minecraft:float_range", mapSet(MINECRAFT_1_20_5, 39), mapSet(MINECRAFT_1_20_3, 38), mapSet(MINECRAFT_1_19_3, 37),
-        mapSet(MINECRAFT_1_19, 38)));
+    empty(id("minecraft:function", mapSet(MINECRAFT_1_21_6, 37), mapSet(MINECRAFT_1_20_5, 36), mapSet(MINECRAFT_1_20_3, 35),
+        mapSet(MINECRAFT_1_19_3, 34), mapSet(MINECRAFT_1_19, 35)));
+    empty(id("minecraft:entity_anchor", mapSet(MINECRAFT_1_21_6, 38), mapSet(MINECRAFT_1_20_5, 37), mapSet(MINECRAFT_1_20_3, 36),
+        mapSet(MINECRAFT_1_19_3, 35), mapSet(MINECRAFT_1_19, 36)));
+    empty(id("minecraft:int_range", mapSet(MINECRAFT_1_21_6, 39), mapSet(MINECRAFT_1_20_5, 38), mapSet(MINECRAFT_1_20_3, 37),
+        mapSet(MINECRAFT_1_19_3, 36), mapSet(MINECRAFT_1_19, 37)));
+    empty(id("minecraft:float_range", mapSet(MINECRAFT_1_21_6, 40), mapSet(MINECRAFT_1_20_5, 39), mapSet(MINECRAFT_1_20_3, 38),
+        mapSet(MINECRAFT_1_19_3, 37), mapSet(MINECRAFT_1_19, 38)));
     empty(id("minecraft:item_enchantment", mapSet(MINECRAFT_1_19_3, -1), mapSet(MINECRAFT_1_19, 39)));
     empty(id("minecraft:entity_summon", mapSet(MINECRAFT_1_19_3, -1), mapSet(MINECRAFT_1_19, 40)));
-    empty(id("minecraft:dimension", mapSet(MINECRAFT_1_20_5, 40), mapSet(MINECRAFT_1_20_3, 39), mapSet(MINECRAFT_1_19_3, 38),
-        mapSet(MINECRAFT_1_19, 41)));
-    empty(id("minecraft:gamemode", mapSet(MINECRAFT_1_20_5, 41), mapSet(MINECRAFT_1_20_3, 40), mapSet(MINECRAFT_1_19_3, 39))); // 1.19.3
+    empty(id("minecraft:dimension", mapSet(MINECRAFT_1_21_6, 41), mapSet(MINECRAFT_1_20_5, 40), mapSet(MINECRAFT_1_20_3, 39),
+        mapSet(MINECRAFT_1_19_3, 38), mapSet(MINECRAFT_1_19, 41)));
+    empty(id("minecraft:gamemode", mapSet(MINECRAFT_1_21_6, 42), mapSet(MINECRAFT_1_20_5, 41), mapSet(MINECRAFT_1_20_3, 40),
+        mapSet(MINECRAFT_1_19_3, 39))); // 1.19.3
 
-    empty(id("minecraft:time", mapSet(MINECRAFT_1_20_5, 42), mapSet(MINECRAFT_1_20_3, 41), mapSet(MINECRAFT_1_19_3, 40),
-        mapSet(MINECRAFT_1_19, 42)), TimeArgumentSerializer.TIME); // added in 1.14
+    empty(id("minecraft:time", mapSet(MINECRAFT_1_21_6, 43), mapSet(MINECRAFT_1_20_5, 42), mapSet(MINECRAFT_1_20_3, 41),
+        mapSet(MINECRAFT_1_19_3, 40), mapSet(MINECRAFT_1_19, 42)), TimeArgumentSerializer.TIME); // added in 1.14
 
-    register(id("minecraft:resource_or_tag", mapSet(MINECRAFT_1_20_5, 43), mapSet(MINECRAFT_1_20_3, 42), mapSet(MINECRAFT_1_19_3, 41),
-        mapSet(MINECRAFT_1_19, 43)), RegistryKeyArgument.class, RegistryKeyArgumentSerializer.REGISTRY);
-    register(id("minecraft:resource_or_tag_key", mapSet(MINECRAFT_1_20_5, 44), mapSet(MINECRAFT_1_20_3, 43), mapSet(MINECRAFT_1_19_3, 42)),
+    register(id("minecraft:resource_or_tag", mapSet(MINECRAFT_1_21_6, 44), mapSet(MINECRAFT_1_20_5, 43), mapSet(MINECRAFT_1_20_3, 42),
+        mapSet(MINECRAFT_1_19_3, 41), mapSet(MINECRAFT_1_19, 43)), RegistryKeyArgument.class, RegistryKeyArgumentSerializer.REGISTRY);
+    register(id("minecraft:resource_or_tag_key", mapSet(MINECRAFT_1_21_6, 45), mapSet(MINECRAFT_1_20_5, 44), mapSet(MINECRAFT_1_20_3, 43),
+        mapSet(MINECRAFT_1_19_3, 42)),
         RegistryKeyArgumentList.ResourceOrTagKey.class,
         RegistryKeyArgumentList.ResourceOrTagKey.Serializer.REGISTRY);
-    register(id("minecraft:resource", mapSet(MINECRAFT_1_20_5, 45), mapSet(MINECRAFT_1_20_3, 44), mapSet(MINECRAFT_1_19_3, 43),
-        mapSet(MINECRAFT_1_19, 44)),
+    register(id("minecraft:resource", mapSet(MINECRAFT_1_21_6, 46), mapSet(MINECRAFT_1_20_5, 45), mapSet(MINECRAFT_1_20_3, 44),
+        mapSet(MINECRAFT_1_19_3, 43), mapSet(MINECRAFT_1_19, 44)),
         RegistryKeyArgument.class, RegistryKeyArgumentSerializer.REGISTRY);
-    register(id("minecraft:resource_key", mapSet(MINECRAFT_1_20_5, 46), mapSet(MINECRAFT_1_20_3, 45), mapSet(MINECRAFT_1_19_3, 44)),
+    register(id("minecraft:resource_key", mapSet(MINECRAFT_1_21_6, 47), mapSet(MINECRAFT_1_20_5, 46), mapSet(MINECRAFT_1_20_3, 45),
+        mapSet(MINECRAFT_1_19_3, 44)),
         RegistryKeyArgumentList.ResourceKey.class,
         RegistryKeyArgumentList.ResourceKey.Serializer.REGISTRY);
-    register(id("minecraft:resource_selector", mapSet(MINECRAFT_1_21_5, 47)),
+    register(id("minecraft:resource_selector", mapSet(MINECRAFT_1_21_6, 48), mapSet(MINECRAFT_1_21_5, 47)),
         RegistryKeyArgumentList.ResourceSelector.class,
         RegistryKeyArgumentList.ResourceSelector.Serializer.REGISTRY);
 
-    empty(id("minecraft:template_mirror", mapSet(MINECRAFT_1_21_5, 48), mapSet(MINECRAFT_1_20_5, 47), mapSet(MINECRAFT_1_20_3, 46), mapSet(MINECRAFT_1_19, 45))); // 1.19
-    empty(id("minecraft:template_rotation", mapSet(MINECRAFT_1_21_5, 49), mapSet(MINECRAFT_1_20_5, 48), mapSet(MINECRAFT_1_20_3, 47), mapSet(MINECRAFT_1_19, 46))); // 1.19
-    empty(id("minecraft:heightmap", mapSet(MINECRAFT_1_21_5, 50), mapSet(MINECRAFT_1_20_3, 49), mapSet(MINECRAFT_1_19_4, 47))); // 1.19.4
+    empty(id("minecraft:template_mirror", mapSet(MINECRAFT_1_21_6, 49), mapSet(MINECRAFT_1_21_5, 48), mapSet(MINECRAFT_1_20_5, 47),
+        mapSet(MINECRAFT_1_20_3, 46), mapSet(MINECRAFT_1_19, 45))); // 1.19
+    empty(id("minecraft:template_rotation", mapSet(MINECRAFT_1_21_6, 50), mapSet(MINECRAFT_1_21_5, 49), mapSet(MINECRAFT_1_20_5, 48),
+        mapSet(MINECRAFT_1_20_3, 47), mapSet(MINECRAFT_1_19, 46))); // 1.19
+    empty(id("minecraft:heightmap", mapSet(MINECRAFT_1_21_6, 51), mapSet(MINECRAFT_1_21_5, 50), mapSet(MINECRAFT_1_20_3, 49),
+        mapSet(MINECRAFT_1_19_4, 47))); // 1.19.4
 
-    empty(id("minecraft:uuid", mapSet(MINECRAFT_1_21_5, 54),mapSet(MINECRAFT_1_20_5, 53), mapSet(MINECRAFT_1_20_3, 48), mapSet(MINECRAFT_1_19_4, 48),
-        mapSet(MINECRAFT_1_19, 47))); // added in 1.16
+    empty(id("minecraft:uuid", mapSet(MINECRAFT_1_21_6, 56), mapSet(MINECRAFT_1_21_5, 54),mapSet(MINECRAFT_1_20_5, 53), mapSet(MINECRAFT_1_20_3, 48),
+        mapSet(MINECRAFT_1_19_4, 48), mapSet(MINECRAFT_1_19, 47))); // added in 1.16
 
-    empty(id("minecraft:loot_table", mapSet(MINECRAFT_1_21_5, 51), mapSet(MINECRAFT_1_20_5, 50)));
-    empty(id("minecraft:loot_predicate", mapSet(MINECRAFT_1_21_5, 52), mapSet(MINECRAFT_1_20_5, 51)));
-    empty(id("minecraft:loot_modifier", mapSet(MINECRAFT_1_21_5, 53), mapSet(MINECRAFT_1_20_5, 52)));
+    empty(id("minecraft:loot_table", mapSet(MINECRAFT_1_21_6, 52), mapSet(MINECRAFT_1_21_5, 51), mapSet(MINECRAFT_1_20_5, 50)));
+    empty(id("minecraft:loot_predicate", mapSet(MINECRAFT_1_21_6, 53), mapSet(MINECRAFT_1_21_5, 52), mapSet(MINECRAFT_1_20_5, 51)));
+    empty(id("minecraft:loot_modifier", mapSet(MINECRAFT_1_21_6, 54), mapSet(MINECRAFT_1_21_5, 53), mapSet(MINECRAFT_1_20_5, 52)));
+
+    empty(id("minecraft:hex_color", mapSet(MINECRAFT_1_21_6, 17))); // added in 1.21.6
+    empty(id("minecraft:dialog", mapSet(MINECRAFT_1_21_6, 55))); // added in 1.21.6
 
     // Crossstitch support
     register(id("crossstitch:mod_argument", mapSet(MINECRAFT_1_19, -256)), ModArgumentProperty.class, MOD);

proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/config/KnownPacksPacket.java

@@ -36,7 +36,7 @@ public class KnownPacksPacket implements MinecraftPacket {
     public void decode(ByteBuf buf, ProtocolUtils.Direction direction,
                        ProtocolVersion protocolVersion) {
         final int packCount = ProtocolUtils.readVarInt(buf);
-        if (packCount > MAX_LENGTH_PACKS) {
+        if (direction == ProtocolUtils.Direction.SERVERBOUND && packCount > MAX_LENGTH_PACKS) {
           throw TOO_MANY_PACKS;
         }
 

proxy/src/main/java/com/velocitypowered/proxy/server/VelocityRegisteredServer.java

@@ -114,7 +114,7 @@ public class VelocityRegisteredServer implements RegisteredServer, ForwardingAud
     server.createBootstrap(loop).handler(new ChannelInitializer<>() {
       @Override
       protected void initChannel(Channel ch) {
-        ch.pipeline().addLast(FRAME_DECODER, new MinecraftVarintFrameDecoder())
+        ch.pipeline().addLast(FRAME_DECODER, new MinecraftVarintFrameDecoder(ProtocolUtils.Direction.CLIENTBOUND))
             .addLast(READ_TIMEOUT, new ReadTimeoutHandler(
                 pingOptions.getTimeout() == 0
                     ? server.getConfiguration().getReadTimeout()

proxy/src/main/java/com/velocitypowered/proxy/util/TranslatableMapper.java

@@ -24,9 +24,6 @@ import net.kyori.adventure.text.Component;
 import net.kyori.adventure.text.TranslatableComponent;
 import net.kyori.adventure.text.flattener.ComponentFlattener;
 import net.kyori.adventure.translation.GlobalTranslator;
-import net.kyori.adventure.translation.TranslationRegistry;
-import net.kyori.adventure.translation.Translator;
-import org.jetbrains.annotations.Nullable;
 
 /**
  * Velocity Translation Mapper.
@@ -43,25 +40,9 @@ public enum TranslatableMapper implements BiConsumer<TranslatableComponent, Cons
           final TranslatableComponent translatableComponent,
           final Consumer<Component> componentConsumer
   ) {
-    for (final Translator source : GlobalTranslator.translator().sources()) {
-      if (source instanceof TranslationRegistry registry
-              && registry.contains(translatableComponent.key())) {
-        componentConsumer.accept(GlobalTranslator.render(translatableComponent,
-                ClosestLocaleMatcher.INSTANCE.lookupClosest(Locale.getDefault())));
-        return;
-      }
-    }
-    final @Nullable String fallback = translatableComponent.fallback();
-    if (fallback == null) {
-      return;
-    }
-    for (final Translator source : GlobalTranslator.translator().sources()) {
-      if (source instanceof TranslationRegistry registry && registry.contains(fallback)) {
-        componentConsumer.accept(
-                GlobalTranslator.render(Component.translatable(fallback),
-                        ClosestLocaleMatcher.INSTANCE.lookupClosest(Locale.getDefault())));
-        return;
-      }
+    final Locale locale = ClosestLocaleMatcher.INSTANCE.lookupClosest(Locale.getDefault());
+    if (GlobalTranslator.translator().canTranslate(translatableComponent.key(), locale)) {
+      componentConsumer.accept(GlobalTranslator.render(translatableComponent, locale));
     }
   }
 }