Worked on the astronomer/airflow repository to address a scheduler bug affecting deferred task state management. Focused on backend development and scheduler design using Python, the developer implemented a targeted fix ensuring that deferred tasks moved back to the scheduled state are not misclassified as state mismatches when executor success is reported late. This solution involved robust state handling logic and the addition of a regression test to cover the defer and reschedule edge case, preventing future recurrences. The work improved the reliability of the deferred task lifecycle and reduced the risk of production failures in scheduled workflow execution.