xBis7 commented on issue #52906:
URL: https://github.com/apache/airflow/issues/52906#issuecomment-3041168665

   I've concluded that the issue is with the 2nd test, 
`test_scheduler_change_after_the_first_task_finishes`.
   
   The test
   * uses 2 schedulers
   * pauses the 1st scheduler thread so that the 2nd will pick up processing 
the dag_run
   * once the dag_run has finished, it resumes the paused scheduler to check 
that it makes the needed updates to the db
   
   Once that fails, then the rest fail as well. After commenting it out, there 
are no more failures.
   
   40/40 successful executions where there used to be 12-15 failures in 40 runs.
   
   https://github.com/xBis7/airflow/actions/runs/16096527407
   
   https://github.com/xBis7/airflow/actions/runs/16096660040
   
   https://github.com/xBis7/airflow/actions/runs/16096742809
   
   https://github.com/xBis7/airflow/actions/runs/16096823166
   
   


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