Update with nms based refresh

FightSystem/FightSystem_Core/src/de/steamwar/fightsystem/listener/PlayerJoinListener.java

@@ -1,7 +1,16 @@
 package de.steamwar.fightsystem.listener;
 
+import net.minecraft.network.protocol.game.ClientboundForgetLevelChunkPacket;
+import net.minecraft.network.protocol.game.ClientboundLevelChunkWithLightPacket;
+import net.minecraft.server.level.ServerPlayer;
+import net.minecraft.world.level.ChunkPos;
+import net.minecraft.world.level.chunk.LevelChunk;
 import org.bukkit.Bukkit;
+import org.bukkit.Chunk;
 import org.bukkit.Location;
+import org.bukkit.World;
+import org.bukkit.craftbukkit.CraftWorld;
+import org.bukkit.craftbukkit.entity.CraftPlayer;
 import org.bukkit.entity.Player;
 import org.bukkit.event.EventHandler;
 import org.bukkit.event.Listener;
@@ -12,6 +21,7 @@ public class PlayerJoinListener implements Listener {
     @EventHandler()
     public void onPlayerJoin(PlayerJoinEvent event) {
         Player player = event.getPlayer();
+        World world = player.getWorld();
 
         Location loc = player.getLocation();
         int viewDistance = Bukkit.getViewDistance();
@@ -22,8 +32,34 @@ public class PlayerJoinListener implements Listener {
         // Iterate through the chunks around the player and force a resend
         for (int x = -viewDistance; x <= viewDistance; x++) {
             for (int z = -viewDistance; z <= viewDistance; z++) {
-                player.getWorld().refreshChunk(chunkX + x, chunkZ + z);
+                Chunk chunk = world.getChunkAt(chunkX + x, chunkZ + z);
+                this.forceRefreshChunkForPlayer(player, chunk);
             }
         }
     }
+
+    public void forceRefreshChunkForPlayer(Player player, Chunk bukkitChunk) {
+        ServerPlayer serverPlayer = ((CraftPlayer) player).getHandle();
+        CraftWorld craftWorld = (CraftWorld) bukkitChunk.getWorld();
+
+        int chunkX = bukkitChunk.getX();
+        int chunkZ = bukkitChunk.getZ();
+
+        LevelChunk nmsChunk = craftWorld.getHandle().getChunkSource().getChunk(chunkX, chunkZ, false);
+        if (nmsChunk == null) {
+            // Chunk isn't loaded in memory on the server side;
+            return;
+        }
+
+        ClientboundForgetLevelChunkPacket unloadPacket = new ClientboundForgetLevelChunkPacket(new ChunkPos(chunkX, chunkZ));
+        serverPlayer.connection.send(unloadPacket);
+
+        ClientboundLevelChunkWithLightPacket loadPacket = new ClientboundLevelChunkWithLightPacket(
+                nmsChunk,
+                craftWorld.getHandle().getLightEngine(),
+                null,
+                null
+        );
+        serverPlayer.connection.send(loadPacket);
+    }
 }