Paper/Spigot-Server-Patches/0408-Fix-tracker-desync-issue.patch

From e7c186d6eb5076f46ddf595ac0249ee937e25d02 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Sun, 23 Jun 2019 19:11:27 -0700
Subject: [PATCH] Fix tracker desync issue


diff --git a/src/main/java/net/minecraft/server/Entity.java b/src/main/java/net/minecraft/server/Entity.java
index 69bfa19274..c5198af94b 100644
--- a/src/main/java/net/minecraft/server/Entity.java
+++ b/src/main/java/net/minecraft/server/Entity.java
@@ -3255,6 +3255,7 @@ public abstract class Entity implements INamableTileEntity, ICommandListener, Ke
         return this.f.j();
     }
 
+    public Vec3D getPositionVector() { return this.ci(); } // Paper - OBFHELPER
     public Vec3D ci() {
         return new Vec3D(this.locX, this.locY, this.locZ);
     }
diff --git a/src/main/java/net/minecraft/server/PlayerChunkMap.java b/src/main/java/net/minecraft/server/PlayerChunkMap.java
index f34d7d0dad..8e16d6ac87 100644
--- a/src/main/java/net/minecraft/server/PlayerChunkMap.java
+++ b/src/main/java/net/minecraft/server/PlayerChunkMap.java
@@ -1238,7 +1238,7 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
         public void updatePlayer(EntityPlayer entityplayer) {
             org.spigotmc.AsyncCatcher.catchOp( "player tracker update"); // Spigot
             if (entityplayer != this.tracker) {
-                Vec3D vec3d = (new Vec3D(entityplayer.locX, entityplayer.locY, entityplayer.locZ)).d(this.trackerEntry.b());
+                Vec3D vec3d = (new Vec3D(entityplayer.locX, entityplayer.locY, entityplayer.locZ)).d(this.tracker.getPositionVector()); // Paper - prevent de-sync issues
                 int i = Math.min(this.trackingDistance, (PlayerChunkMap.this.viewDistance - 1) * 16);
                 boolean flag = vec3d.x >= (double) (-i) && vec3d.x <= (double) i && vec3d.z >= (double) (-i) && vec3d.z <= (double) i && this.tracker.a(entityplayer);
 
-- 
2.22.0