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..0312d68f0f64fa9e5816fe12a09430208ae2b8ce 100644
--- a/src/main/java/net/minecraft/world/level/chunk/Chunk.java
+++ b/src/main/java/net/minecraft/world/level/chunk/Chunk.java
@@ -648,6 +648,10 @@ 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!");