kaxil commented on PR #73923:
URL: https://github.com/apache/airflow/pull/73923#issuecomment-5939766409

   Closing this. The task-group check doesn't run on real Dags: nested groups 
are serialized as `(TASK_GROUP, {...})` tuples, and `_validate_task_group_ids` 
only recurses into children that are dicts with a `children` key, so only the 
hand-built dict in the test reaches it. The new check also applies core's 
`validate_key` to every Dag, Python ones included. That rejects ids containing 
`..`, which the Task SDK accepts, so Dags that parse today would become import 
errors. The description and tests don't cover either case.


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