diff --git a/adapters/modded-common/src/main/java/art/arcane/iris/modded/WorldCheckDimensionContract.java b/adapters/modded-common/src/main/java/art/arcane/iris/modded/WorldCheckDimensionContract.java
index 21d68236b..3409c74ee 100644
--- a/adapters/modded-common/src/main/java/art/arcane/iris/modded/WorldCheckDimensionContract.java
+++ b/adapters/modded-common/src/main/java/art/arcane/iris/modded/WorldCheckDimensionContract.java
@@ -86,7 +86,8 @@ final class WorldCheckDimensionContract {
                 (float) json.getDouble("ambient_light"),
                 json.getBoolean("has_skylight"),
                 json.getBoolean("has_ceiling"),
-                json.getBoolean("has_ender_dragon_fight"),
+                json.has("has_ender_dragon_fight") ? json.getBoolean("has_ender_dragon_fight")
+                        : "minecraft:the_end".equals(json.optString("effects")),
                 json.getInt("monster_spawn_block_light_limit"));
     }