MaiHoangViet1809 commented on issue #27952:
URL: https://github.com/apache/airflow/issues/27952#issuecomment-1344420984
the log from v2.5.0 is below:
```
Broken DAG: [/********/airflow/dags/reproduce_error_for_27952.py] Traceback
(most recent call last):
File
"/********/env3.10.5/lib/python3.10/site-packages/airflow/models/baseoperator.py",
line 411, in apply_defaults
result = func(self, **kwargs, default_args=default_args)
File
"/********/env3.10.5/lib/python3.10/site-packages/airflow/sensors/external_task.py",
line 165, in __init__
if external_task_ids and len(external_task_ids) >
len(set(external_task_ids)):
TypeError: object of type 'PlainXComArg' has no len()
```
note: masked path with ********
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