From 26c66710ce4ea03f619332450c61fea2376fc191 Mon Sep 17 00:00:00 2001
From: CraftBukkit/Spigot <noreply+git-craftbukkit@papermc.io>
Date: Fri, 10 Jan 2020 09:22:31 +1100
Subject: [PATCH] SPIGOT-5506: CustomChunkGenerator is processing Phantoms in
 the Nether and The End

By: md_5 <git@md-5.net>
---
 .../craftbukkit/generator/CustomChunkGenerator.java    | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/paper-server/src/main/java/org/bukkit/craftbukkit/generator/CustomChunkGenerator.java b/paper-server/src/main/java/org/bukkit/craftbukkit/generator/CustomChunkGenerator.java
index fbc9b946aa..1e0cba4cef 100644
--- a/paper-server/src/main/java/org/bukkit/craftbukkit/generator/CustomChunkGenerator.java
+++ b/paper-server/src/main/java/org/bukkit/craftbukkit/generator/CustomChunkGenerator.java
@@ -178,10 +178,12 @@ public class CustomChunkGenerator extends InternalChunkGenerator<GeneratorSettin
 
     @Override
     public void doMobSpawning(WorldServer worldserver, boolean flag, boolean flag1) {
-        this.mobSpawnerPhantom.a(worldserver, flag, flag1);
-        this.mobSpawnerPatrol.a(worldserver, flag, flag1);
-        this.mobSpawnerCat.a(worldserver, flag, flag1);
-        this.villageSiege.a(worldserver, flag, flag1);
+        if (worldserver.getWorldProvider().isOverworld()) {
+            this.mobSpawnerPhantom.a(worldserver, flag, flag1);
+            this.mobSpawnerPatrol.a(worldserver, flag, flag1);
+            this.mobSpawnerCat.a(worldserver, flag, flag1);
+            this.villageSiege.a(worldserver, flag, flag1);
+        }
     }
 
     @Override