YoannAbriel commented on PR #63250:
URL: https://github.com/apache/airflow/pull/63250#issuecomment-4042253948

   Reproduced and verified on Airflow 3.1.8 (standalone, SequentialExecutor). 
Test DAG with `dagrun_timeout=timedelta(seconds=30)` and 3 tasks chained: 
`quick_task` (5s) -> `slow_task` (120s) -> `final_task` (5s).
   
   **Before fix (unpatched 3.1.8):**
   
   | Task | State | end_date |
   |------|-------|----------|
   | quick_task | success | 2026-03-11 21:05:05 |
   | slow_task | skipped | None |
   | final_task | None | None |
   
   **After fix:**
   
   | Task | State | end_date |
   |------|-------|----------|
   | quick_task | success | 2026-03-11 21:09:21 |
   | slow_task | skipped | 2026-03-11 21:09:45 |
   | final_task | None | None (never started, expected) |
   
   ![Test 
evidence](https://raw.githubusercontent.com/YoannAbriel/YoannAbriel.github.io/master/pr-63250-evidence-v2.png)
   
   Two lines in `_schedule_dag_run` — `now = timezone.utcnow()` and 
`task_instance.end_date = now` before merging skipped tasks.


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