uranusjr commented on code in PR #61019:
URL: https://github.com/apache/airflow/pull/61019#discussion_r3456828270


##########
airflow-core/src/airflow/dag_processing/manager.py:
##########
@@ -430,9 +430,10 @@ def deactivate_stale_dags(
         for dag in dags_parsed:
             # Dags whose bundle has been removed from config (bundle no longer 
active) are stale —
             # the processor has stopped parsing their files, so the time-based 
check below would never fire.
-            if dag.bundle_name in inactive_bundles:
+            # Legacy DAGs with a NULL bundle_name (e.g. from Airflow 2.x) are 
also stale, as they will never be parsed.
+            if dag.bundle_name is None or dag.bundle_name in inactive_bundles:

Review Comment:
   Can you expand the in-code comment a bit? The context you provided is 
critical to understand why the check is needed, but the current wording fails 
to capture it.



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