diff --git a/Spigot-Server-Patches/Add-Debug-Entities-option-to-debug-dupe-uuid-issues.patch b/Spigot-Server-Patches/Add-Debug-Entities-option-to-debug-dupe-uuid-issues.patch
index dceaca58c0..112f42f084 100644
--- a/Spigot-Server-Patches/Add-Debug-Entities-option-to-debug-dupe-uuid-issues.patch
+++ b/Spigot-Server-Patches/Add-Debug-Entities-option-to-debug-dupe-uuid-issues.patch
@@ -5,8 +5,27 @@ Subject: [PATCH] Add Debug Entities option to debug dupe uuid issues
 
 Add -Ddebug.entities=true to your JVM flags to gain more information
 
+diff --git a/src/main/java/net/minecraft/server/ChunkRegionLoader.java b/src/main/java/net/minecraft/server/ChunkRegionLoader.java
+index bcce5e8b7..f5b9aa561 100644
+--- a/src/main/java/net/minecraft/server/ChunkRegionLoader.java
++++ b/src/main/java/net/minecraft/server/ChunkRegionLoader.java
+@@ -0,0 +0,0 @@ public class ChunkRegionLoader implements IChunkLoader, IAsyncChunkSaver {
+ 
+             while (iterator.hasNext()) {
+                 Entity entity = (Entity) iterator.next();
++                // Paper start
++                if (entity.getChunkX() != chunk.locX || entity.getChunkZ() != chunk.locZ) {
++                    LogManager.getLogger().error(entity + " is not actually in this chunk! Report this to https://github.com/PaperMC/Paper/issues/1223", new Throwable());
++                }
++                if ((int)Math.floor(entity.locX) >> 4 != chunk.locX || (int)Math.floor(entity.locZ) >> 4 != chunk.locZ) {
++                    LogManager.getLogger().error(entity + " will be leaving this chunk but saved to it. Report this to https://github.com/PaperMC/Paper/issues/1223", new Throwable());
++                }
++                // Paper end
+ 
+                 nbttagcompound1 = new NBTTagCompound();
+                 if (entity.d(nbttagcompound1)) {
 diff --git a/src/main/java/net/minecraft/server/Entity.java b/src/main/java/net/minecraft/server/Entity.java
-index f6b755863..108654d63 100644
+index 99dac412f..0d3af8cb7 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