GitHub user PowerToThePeople111 edited a comment on the discussion: Some tasks 
in mapped tasks fail before starting, logs are empty

Ok, observing it even further, I found that exactly the tasks 1,3 and 4 which 
have been initially queued, but not been executed, are now marked as "up for 
retry" and will probably fail later on. My hunge is, that if your 
max_active_tis_per_dagrun is bigger than the number of workers that can be 
spawned (I guess infra started to limit me ;) ) to actually run in parallel, 
this can cause mapped tasks to fail.

My current approach is to set max_active_tis_per_dagrun to 1, forcing airflow 
to do things step by step.

GitHub link: 
https://github.com/apache/airflow/discussions/42039#discussioncomment-11341297

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