diff --git a/lib/galaxy/metadata/set_metadata.py b/lib/galaxy/metadata/set_metadata.py
index fbfb2db78f0..078b99ed4dd 100644
--- a/lib/galaxy/metadata/set_metadata.py
+++ b/lib/galaxy/metadata/set_metadata.py
@@ -302,8 +302,7 @@ def set_metadata_portable(
         # discover extra outputs...
         output_collections = {}
         for name, output_collection in metadata_params["output_collections"].items():
-            # TODO: remove HistoryDatasetCollectionAssociation fallback on 22.01, model_class used to not be serialized prior to 21.09
-            model_class = output_collection.get("model_class", "HistoryDatasetCollectionAssociation")
+            model_class = output_collection["model_class"]
             collection = import_model_store.sa_session.query(getattr(galaxy.model, model_class)).find(
                 output_collection["id"]
             )