matthewblock commented on issue #27449:
URL: https://github.com/apache/airflow/issues/27449#issuecomment-1301198284
A few other details I discovered while debugging:
- The "first" (most upstream) `upstream_failed` tasks have no `start_date`
or `end_date` but the tasks immediately downstream of them that are also
`upstream_failed` _do_ have `start_date` and `end_date`
- I noticed in another task that ran successfully, that is in parallel to
the `upstream_failed` tasks, log this:
```
[2022-11-01, 09:15:25 PDT] {mappedoperator.py:622} INFO - Cannot expand
<Mapped(MyCustomOperator): my_custom_task_1> for run
manual__2022-11-01T16:06:39.483587+00:00; missing upstream values:
['my_xcom_value']
[2022-11-01, 09:15:25 PDT] {mappedoperator.py:622} INFO - Cannot expand
<Mapped(MyCustomOperator): my_custom_task_2> for run
manual__2022-11-01T16:06:39.483587+00:00; missing upstream values:
['my_xcom_value']
```
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