uranusjr commented on pull request #17544:
URL: https://github.com/apache/airflow/pull/17544#issuecomment-897538890


   Writing a proper test turns out to be a long journey figuring out a right 
combination to trigger this bug. So to trigger this bug, a DAG should _not_ be 
in the DagBag, but _in_ the DagModel table, but _not_ in the SerializedDagModel 
table.
   
   @georborodin Does the DAG you deleted from the web UI have subdags? This is 
the only situation I’ve managed to set up a proper environment for the test. 
(Although I wouldn’t be surprised if there’s more I couldn’t locate.)


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