dstandish commented on a change in pull request #19267:
URL: https://github.com/apache/airflow/pull/19267#discussion_r739609644



##########
File path: airflow/serialization/serialized_objects.py
##########
@@ -417,7 +417,10 @@ def _serialize_param(cls, param: Param):
     @classmethod
     def _deserialize_param(cls, param_dict: Dict):
         param_class = import_string(param_dict.pop(Param.CLASS_IDENTIFIER))
-        param_kwargs = cls._deserialize(param_dict)
+        try:
+            param_kwargs = cls._deserialize(param_dict)
+        except KeyError:
+            param_kwargs = param_dict

Review comment:
       after chatting with kaxil, we need to restore support for this before 
properly deprecating




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