PaperMC/Unmapped-Spigot-Server-Patches/0022-Remove-invalid-mob-spawner-tile-entities.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Byteflux <byte@byteflux.net>
Date: Tue, 1 Mar 2016 15:08:03 -0600
Subject: [PATCH] Remove invalid mob spawner tile entities


diff --git a/src/main/java/net/minecraft/world/level/chunk/Chunk.java b/src/main/java/net/minecraft/world/level/chunk/Chunk.java
index ac576d268b23148089d404cb22d8c2f9d1a79d6e..a2d80c2c8e4f080f60746548f75631c5946ba8e2 100644
--- a/src/main/java/net/minecraft/world/level/chunk/Chunk.java
+++ b/src/main/java/net/minecraft/world/level/chunk/Chunk.java
@@ -40,9 +40,11 @@ import net.minecraft.world.level.TickListChunk;
 import net.minecraft.world.level.TickListEmpty;
 import net.minecraft.world.level.World;
 import net.minecraft.world.level.block.Block;
+import net.minecraft.world.level.block.BlockMobSpawner;
 import net.minecraft.world.level.block.Blocks;
 import net.minecraft.world.level.block.ITileEntity;
 import net.minecraft.world.level.block.entity.TileEntity;
+import net.minecraft.world.level.block.entity.TileEntityMobSpawner;
 import net.minecraft.world.level.block.state.IBlockData;
 import net.minecraft.world.level.levelgen.ChunkProviderDebug;
 import net.minecraft.world.level.levelgen.HeightMap;
@@ -648,6 +650,10 @@ public class Chunk implements IChunkAccess {
             }
 
             // CraftBukkit start
+            // Paper start - Remove invalid mob spawner tile entities
+        } else if (tileentity instanceof TileEntityMobSpawner && !(getBlockData(blockposition.getX(), blockposition.getY(), blockposition.getZ()).getBlock() instanceof BlockMobSpawner)) {
+            this.tileEntities.remove(blockposition);
+            // Paper end
         } else {
             System.out.println("Attempted to place a tile entity (" + tileentity + ") at " + tileentity.getPosition().getX() + "," + tileentity.getPosition().getY() + "," + tileentity.getPosition().getZ()
                 + " (" + getType(blockposition) + ") where there was no entity tile!");