MolochkoVitaly opened a new issue #13101:
URL: https://github.com/apache/airflow/issues/13101
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**Apache Airflow version**: 1.10.10
**What happened**:
```
from airflow.operators.dummy_operator import DummyOperator
from airflow import DAG
from datetime import datetime
default_args = {
'start_date': datetime(2021, 1, 1),
'owner': 'airflow'
}
dag = DAG('dummy_dag', default_args=default_args)
op1 = DummyOperator(task_id="op1", dag=dag)
op2 = DummyOperator(task_id="op2", dag=dag)
op3 = DummyOperator(task_id="op3", dag=dag)
op4 = DummyOperator(task_id="op4", dag=dag)
op5 = DummyOperator(task_id="op5", dag=dag)
op1 >> [op2, op3 >> op4] >> op5
```
<!-- (please include exact error messages if you can) -->
**What you expected to happen**:
**How to reproduce it**:
Run code above
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