build-data/paper.at

@@ -186,6 +186,7 @@ public net.minecraft.world.entity.Entity getEncodeId()Ljava/lang/String;
 public net.minecraft.world.entity.Entity getFireImmuneTicks()I
 public net.minecraft.world.entity.Entity getSharedFlag(I)Z
 public net.minecraft.world.entity.Entity hasVisualFire
+public net.minecraft.world.entity.Entity isAffectedByBlocks()Z
 public net.minecraft.world.entity.Entity isInBubbleColumn()Z
 public net.minecraft.world.entity.Entity isInRain()Z
 public net.minecraft.world.entity.Entity isInvulnerableToBase(Lnet/minecraft/world/damagesource/DamageSource;)Z

paper-server/patches/features/0031-Do-not-record-movement-for-vehicles-players-unaffect.patch

@@ -0,0 +1,34 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Spottedleaf <Spottedleaf@users.noreply.github.com>
+Date: Sun, 2 Feb 2025 10:57:48 -0800
+Subject: [PATCH] Do not record movement for vehicles/players unaffected by
+ blocks
+
+If the player is not affected by movement through blocks, then
+storing the movement would eventually invoke logic to apply effects
+caused by moving through such blocks. For example, moving through
+a portal in spectator mode and then later switching to creative mode
+would portal the player.
+
+diff --git a/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+index 5738709f5fa6fee2ed88ba41a7718c976b780e96..882dbb1276c548316938bbc50f5f7e01f8547ff8 100644
+--- a/net/minecraft/server/network/ServerGamePacketListenerImpl.java
++++ b/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+@@ -657,7 +657,7 @@ public class ServerGamePacketListenerImpl
+                 // CraftBukkit end
+ 
+                 this.player.serverLevel().getChunkSource().move(this.player);
+-                rootVehicle.recordMovementThroughBlocks(new Vec3(x, y, z), rootVehicle.position());
++                if (!rootVehicle.isSpectator() && rootVehicle.isAffectedByBlocks()) rootVehicle.recordMovementThroughBlocks(new Vec3(x, y, z), rootVehicle.position());
+                 Vec3 vec3 = new Vec3(rootVehicle.getX() - x, rootVehicle.getY() - y, rootVehicle.getZ() - z);
+                 this.handlePlayerKnownMovement(vec3);
+                 rootVehicle.setOnGroundWithMovement(packet.onGround(), vec3);
+@@ -1574,7 +1574,7 @@ public class ServerGamePacketListenerImpl
+                                 Vec3 vec3 = new Vec3(this.player.getX() - x, this.player.getY() - y, this.player.getZ() - z);
+                                 this.player.setOnGroundWithMovement(packet.isOnGround(), packet.horizontalCollision(), vec3);
+                                 this.player.doCheckFallDamage(vec3.x, vec3.y, vec3.z, packet.isOnGround());
+-                                this.player.recordMovementThroughBlocks(new Vec3(x, y, z), this.player.position());
++                                if (!this.player.isSpectator() && this.player.isAffectedByBlocks()) this.player.recordMovementThroughBlocks(new Vec3(x, y, z), this.player.position());
+                                 this.handlePlayerKnownMovement(vec3);
+                                 if (flag) {
+                                     this.player.resetFallDistance();