get_substates() already returns a set

reflex/state.py

@@ -965,7 +965,7 @@ def get_all_substate_classes(cls) -> set[Type[BaseState]]:
         Returns:
             The set of all substate classes.
         """
-        substates = set(cls.get_substates())
+        substates = cls.get_substates()
         for substate in cls.get_substates():
             substates.update(substate.get_all_substate_classes())
         return substates