--- a/net/minecraft/gametest/framework/GameTestMainUtil.java
+++ b/net/minecraft/gametest/framework/GameTestMainUtil.java
@@ -77,7 +_,7 @@
                 copyPacks(string, string1);
             }
 
-            LevelStorageSource.LevelStorageAccess levelStorageAccess = LevelStorageSource.createDefault(Paths.get(string)).createAccess("gametestworld");
+            LevelStorageSource.LevelStorageAccess levelStorageAccess = LevelStorageSource.createDefault(Paths.get(string)).createAccess("gametestworld", net.minecraft.world.level.dimension.LevelStem.OVERWORLD); // Paper
             PackRepository packRepository = ServerPacksSource.createPackRepository(levelStorageAccess);
             MinecraftServer.spin(
                 thread -> GameTestServer.create(thread, levelStorageAccess, packRepository, optionalFromOption(optionSet, tests), optionSet.has(verify))
