Core: differentiate between unknown worlds and broken worlds in error message (#2903)

worlds/__init__.py

@@ -20,9 +20,13 @@ __all__ = {
     "user_folder",
     "GamesPackage",
     "DataPackage",
+    "failed_world_loads",
 }
 
 
+failed_world_loads: List[str] = []
+
+
 class GamesPackage(TypedDict, total=False):
     item_name_groups: Dict[str, List[str]]
     item_name_to_id: Dict[str, int]
@@ -87,6 +91,7 @@ class WorldSource:
             file_like.seek(0)
             import logging
             logging.exception(file_like.read())
+            failed_world_loads.append(os.path.basename(self.path).rsplit(".", 1)[0])
             return False