Dev-iL commented on PR #51556:
URL: https://github.com/apache/airflow/pull/51556#issuecomment-2965605450

   Why is the expected behavior that mapping over a custom key is forbidden?
   
   Would it possible to add a fix suggestion (or a doc link with fix 
suggestions) to the error message? It could be one of the following:
   - Encouraging the user to split the task such that mapped-on output is the 
only output. (Workaround suggested by @jroachgolf84 )
   - Add a passthrough task for unpacking the specific output to map on. 
(Workaround mentioned in the issue)
   - [Mapping over a task 
group](https://airflow.apache.org/docs/apache-airflow/stable/authoring-and-scheduling/dynamic-task-mapping.html#mapping-over-a-task-group)
 docs (after adding a note on this topic).


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