pierrejeambrun commented on PR #44701:
URL: https://github.com/apache/airflow/pull/44701#issuecomment-2539140079

   > example_external_task_marker_parent: did not have any downstream deps
   
   Indeed. That's a limitation we have at the moment in the backend in 
`detect_task_dependencies`.  only `TriggerDagRunOperator` and 
`ExternalTaskSensor` are supported. `ExternalTaskMarker` is not. We might want 
to add it but this will impact the serialized dags and I'm not sure yet how 
free we are of updating that. (and how this dependencies are then used by the 
scheduler I assume)
   
   I will open a dedicated issue to track that because it needs its own set of 
change to be able to work.


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