Lee-W opened a new pull request, #70954:
URL: https://github.com/apache/airflow/pull/70954

   airflowctl's datamodels are generated from the newest Airflow API spec, so a 
server on an older Airflow line legitimately omits fields the models declare as 
required. Collection responses already tolerated that via fill_missing_fields, 
added in #63388 for exactly this reason, but only inside execute_list. Every 
single-object response validated strictly, so commands such as dags 
get-details, dags unpause and dags update failed:
   
       ValidationError: 2 validation errors for DAGResponse
         is_backfillable      Field required
         timetable_periodic   Field required
   
   against any Airflow older than the line the models were generated from.
   
   Lift the validation out of execute_list into a shared validate_response() 
and use it for all 46 single-object responses. LoginOperations keeps strict 
validation on purpose — a defaulted token should fail loudly rather than be 
filled in.
   
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