Setup/Teardown in nested Task Groups creating unwanted dependencies with downstream tasks

[ardubev16]

Apache Airflow version

2.8.0

If "Other Airflow 2 version" selected, which one?

No response

What happened?

The code below, in the "How to reproduce" section, produces the following DAG, I think there is an extra connection rendered between test_task and outer_end.

What you think should happen instead?

I would expect that middle_end is executed after test_group and, that outer_end is executed after test_group2. Since inner_end is a teardown task it is not considered a leaf of test_group, thus the only leaf of test_group is test_task. So, I would expect only the connection between test_task and middle_end, and not the connection between test_task and outer_end.

How to reproduce

Ddecorate the following function to become a DAG and call it to create the DAG:

def nesting_groups_test():
    @task
    def test_task():
        print("Hello world!")

    @task_group
    def test_group():
        inner_start = EmptyOperator(task_id="inner_start")
        inner_end = EmptyOperator(task_id="inner_end")

        test_task_r = test_task()
        inner_start >> test_task_r >> inner_end.as_teardown(setups=inner_start)

    @task_group
    def test_group2():
        middle_end = EmptyOperator(task_id="middle_end")
        test_group_r = test_group()
        test_group_r >> middle_end

    outer_start = EmptyOperator(task_id="outer_start")
    outer_end = EmptyOperator(task_id="outer_end")
    test_group2_r = test_group2()
    outer_start >> test_group2_r >> outer_end

Operating System

Ubuntu 22.04.3 LTS

Versions of Apache Airflow Providers

No response

Deployment

Docker-Compose

Deployment details

No response

Anything else?

This seems to be just a rendering issue since I've done some simple tests and the tasks have been executed in order, but I'm not 100% sure.

Are you willing to submit PR?

• Yes I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct

[boring-cyborg]

Thanks for opening your first issue here! Be sure to follow the issue template! If you are willing to raise PR to address this issue please do so, no need to wait for approval.

[potiuk]

CC: @dstandish - I might take a close look (I want to learn more about the setup/teardown implementation) - possibly after holidays but If you happen to be around and know by heart that could be also helpful :)

[dstandish]

Looks like bug, thanks.