Pranaykarvi commented on issue #63436:
URL: https://github.com/apache/airflow/issues/63436#issuecomment-4052927462

   Looking at the `CronPartitionTimetable` implementation, the issue likely 
stems from `next_dagrun_info()` returning `None` when `catchup=False` and no 
valid next run time can be computed from the cron expression relative to the 
current time.
   
   The scheduler expects `dag_model.next_dagrun` to be set after calling 
`next_dagrun_info()`, but `CronPartitionTimetable` may not be handling the 
`restriction.earliest` / `restriction.latest` boundary conditions the same way 
`CronDataIntervalTimetable` does, resulting in `None` being returned instead of 
a valid `DagRunInfo`.
   
   Relevant files to investigate:
   - `airflow-core/src/airflow/timetables/partitioned.py` — 
`CronPartitionTimetable.next_dagrun_info()`
   - `airflow-core/src/airflow/jobs/scheduler_job_runner.py` line 2043 — where 
the `None` check fails


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