Fix false positive on Chunk Entity slice messages #1302

Update links too

Spigot-Server-Patches/Add-some-Debug-to-Chunk-Entity-slices.patch

@@ -9,7 +9,7 @@ This should hopefully avoid duplicate entities ever being created
 if the entity was to end up in 2 different chunk slices
 
 diff --git a/src/main/java/net/minecraft/server/Chunk.java b/src/main/java/net/minecraft/server/Chunk.java
-index 195cde784b..575ddcb2a0 100644
+index 195cde784b..82abe2a914 100644
 --- a/src/main/java/net/minecraft/server/Chunk.java
 +++ b/src/main/java/net/minecraft/server/Chunk.java
 @@ -0,0 +0,0 @@ public class Chunk {
@@ -21,13 +21,14 @@ index 195cde784b..575ddcb2a0 100644
          // Paper start
 +        List<Entity> entitySlice = this.entitySlices[k];
 +        boolean inThis = entitySlice.contains(entity);
-+        if (entity.entitySlice != null || inThis) {
-+            if (entity.entitySlice == entitySlice || inThis) {
-+                LogManager.getLogger().warn(entity + " was already in this chunk section! Report this to https://github.com/PaperMC/Paper/issues/1223");
++        List<Entity> currentSlice = entity.entitySlice;
++        if ((currentSlice != null && currentSlice.contains(entity)) || inThis) {
++            if (currentSlice == entitySlice || inThis) {
++                LogManager.getLogger().warn(entity + " was already in this chunk section! Report this to https://github.com/PaperMC/Paper/issues/1302");
 +                new Throwable().printStackTrace();
 +                return;
 +            } else {
-+                LogManager.getLogger().warn(entity + " is still in another ChunkSection! Report this to https://github.com/PaperMC/Paper/issues/1223");
++                LogManager.getLogger().warn(entity + " is still in another ChunkSection! Report this to https://github.com/PaperMC/Paper/issues/1302");
 +
 +                Chunk chunk = entity.getCurrentChunk();
 +                if (chunk != null) {
@@ -48,18 +49,18 @@ index 195cde784b..575ddcb2a0 100644
          entity.setCurrentChunk(this);
          entityCounts.increment(entity.getMinecraftKeyString());
 @@ -0,0 +0,0 @@ public class Chunk {
+         }
  
          // Paper start
-         if (!this.entitySlices[i].remove(entity)) { return; }
 +        if (entitySlices[i] == entity.entitySlice) {
 +            entity.entitySlice = null;
 +        } else {
-+            LogManager.getLogger().warn(entity + " was removed from a entitySlice we did not expect. Report this to https://github.com/PaperMC/Paper/issues/1223");
++            LogManager.getLogger().warn(entity + " was removed from a entitySlice we did not expect. Report this to https://github.com/PaperMC/Paper/issues/1302");
 +            new Throwable().printStackTrace();
 +        }
+         if (!this.entitySlices[i].remove(entity)) { return; }
          this.markDirty();
          entity.setCurrentChunk(null);
-         entityCounts.decrement(entity.getMinecraftKeyString());
 @@ -0,0 +0,0 @@ public class Chunk {
                  }
                  // Spigot End
@@ -69,14 +70,14 @@ index 195cde784b..575ddcb2a0 100644
                  // Do not pass along players, as doing so can get them stuck outside of time.
                  // (which for example disables inventory icon updates and prevents block breaking)
 diff --git a/src/main/java/net/minecraft/server/Entity.java b/src/main/java/net/minecraft/server/Entity.java
-index eb8904a728..1e64d5fcd6 100644
+index eb8904a728..86b0b84335 100644
 --- a/src/main/java/net/minecraft/server/Entity.java
 +++ b/src/main/java/net/minecraft/server/Entity.java
 @@ -0,0 +0,0 @@ public abstract class Entity implements ICommandListener, KeyedObject { // Paper
              }
          }
      };
-+    Object entitySlice = null;
++    List<Entity> entitySlice = null;
      // Paper end
      static boolean isLevelAtLeast(NBTTagCompound tag, int level) {
          return tag.hasKey("Bukkit.updateLevel") && tag.getInt("Bukkit.updateLevel") >= level;

Spigot-Server-Patches/Entity-add-to-world-fixes.patch

@@ -14,7 +14,7 @@ Fix this by differing entity add to world for all entities at the same time
 the original entity is dead, overwrite it as the logic does for unloaod queued entities.
 
 diff --git a/src/main/java/net/minecraft/server/Chunk.java b/src/main/java/net/minecraft/server/Chunk.java
-index 575ddcb2a0..3d512d7595 100644
+index 82abe2a914..f618e8f628 100644
 --- a/src/main/java/net/minecraft/server/Chunk.java
 +++ b/src/main/java/net/minecraft/server/Chunk.java
 @@ -0,0 +0,0 @@ public class Chunk {
@@ -41,7 +41,7 @@ index 575ddcb2a0..3d512d7595 100644
      }
  
 diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
-index 2ad7c75d2b..c04a9d5a09 100644
+index 4a16f7ac71..04d0fa1df9 100644
 --- a/src/main/java/net/minecraft/server/World.java
 +++ b/src/main/java/net/minecraft/server/World.java
 @@ -0,0 +0,0 @@ public abstract class World implements IBlockAccess {