dzpan0 opened a new pull request, #64394:
URL: https://github.com/apache/airflow/pull/64394
## Root cause
In execute(), the deferrable path calls self.defer() directly without first
calling _check_for_existence.
## Fix
For Airflow < 3.0, call _check_for_existence inside a scoped create_session
block before running self.defer() if check_existence flag is set to True.
This fix only works for versions below 3.0 since there is no direct way to
assert DAG existence on higher versions. One possible solution would be
creating a new RPC call to try to retrieve a specific DAG, but I'm not on
creating it just for this reason.
closes: #40745
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