Tests not selected when running with -n auto --dist loadgroup

Summary:

I am encountering an issue where no test cases are selected when running tests in parallel with pytest-xdist using the arguments -n auto --dist loadgroup. This issue arose suddenly, and previously, the same setup worked fine.

My test suite includes the use of the @pytest.mark.xdist_group(name="quotation") decorator to group related tests, ensuring they run on the same worker. However, now the test run outputs 0 cases selected, despite tests running correctly without the --dist loadgroup option.

When running the tests without these arguments, tests are executed correctly.

Details:
Environment:
Python version: 3.9.11
pytest version: 8.0.2
pytest-xdist version: 2.5.0
Running tests in a Linux environment via Jenkins.
Error/Output:

[INFO]: 0 个cases selected
============================= test session starts ==============================
platform linux -- Python 3.9.11, pytest-8.0.2, pluggy-1.5.0 -- /usr/bin/python
cachedir: .pytest_cache

Did anything changed that can affect this?

Thank you in advance!

Start by reproducing the reported command, -n auto --dist loadgroup, with Python 3.9.11, pytest 8.0.2, and pytest-xdist 2.5.0, then compare it with the same suite without --dist loadgroup. Trace how @pytest.mark.xdist_group(name="quotation") affects test selection; done means identifying why zero cases are selected and verifying the behavior with a regression test.