Fix bug in JSON deserialization: Don't modify input

common_py/src/videoag_common/miscellaneous/json_serializable.py

@@ -426,8 +426,8 @@ class TypedJsonDataClass[T: str or "JsonSerializableEnum"](JsonDataClass):
         if type_str not in cls.__classes_by_json_str_type__:
             json.get("type").raise_error(f"Unknown type '{type_str}'. Possible values: {', '.join(cls.__classes_by_json_str_type__.keys())}")
         
-        # Remove type from data
-        raw_json = json.get_unsafe_data()
+        # Remove type from data on a COPY! Very IMPORTANT, otherwise weird things happen!
+        raw_json = dict(json.get_unsafe_data())
         raw_json.pop("type")
         json = CJsonObject(raw_json)
         return cls.__classes_by_json_str_type__[type_str].from_json(json, _do_type_check=False)