opeida commented on issue #48554:
URL: https://github.com/apache/airflow/issues/48554#issuecomment-2919179641
I faced the same ImportError trying to evaluate
`LazyXComSequence(<unevaluated length>)` in the reduce function during dynamic
task mapping. Running with `dag.test()`, LocalExecutor, Airflow 3.0.1.
```Python
# Reduce function
@task
def send_notifications(data_to_notificate: list[tuple[Rule,
ObjectStoragePath]], **context) -> None:
for rule, input_file in data_to_notificate: # The error raises here
...
```
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