jceresini opened a new issue #19902:
URL: https://github.com/apache/airflow/issues/19902
### Apache Airflow version
2.2.2 (latest released)
### Operating System
MacOS 11.6.1
### Versions of Apache Airflow Providers
$ pip freeze | grep airflow
apache-airflow==2.2.2
apache-airflow-providers-celery==2.1.0
apache-airflow-providers-ftp==2.0.1
apache-airflow-providers-http==2.0.1
apache-airflow-providers-imap==2.0.1
apache-airflow-providers-sqlite==2.0.1
### Deployment
Other
### Deployment details
`airflow standalone`
### What happened
Exception raised :
```
raise DuplicateTaskIdFound(f"Task id '{key}' has already been added to the
DAG")
airflow.exceptions.DuplicateTaskIdFound: Task id 'do_all_things.do_thing__1'
has already been added to the DAG
```
### What you expected to happen
_No response_
### How to reproduce
* Add the following python file to the `dags` folder:
```python
from datetime import datetime
from airflow.decorators import dag, task, task_group
@dag(start_date=datetime(2023, 1, 1), schedule_interval="@once")
def test_dag_1():
@task
def start():
pass
@task
def do_thing(x):
print(x)
@task_group
def do_all_things():
for i in range(5):
do_thing(i)
@task
def end():
pass
start() >> do_all_things() >> end()
test_dag_1()
```
* Start airflow by running `airflow standalone`
### Anything else
_No response_
### Are you willing to submit PR?
- [ ] Yes I am willing to submit a PR!
### Code of Conduct
- [X] I agree to follow this project's [Code of
Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)
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