uranusjr commented on issue #23838:
URL: https://github.com/apache/airflow/issues/23838#issuecomment-1160137448

   The most immediate problem is we’re trying to expand a _deserialised_ mapped 
operator. This does not work; only a “real” mapped operator can be properly 
expanded. We should fix this, _and_ figure out a way to prevent this from 
happening again.


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