Running with xdist results in unexpected 403 status codes from DRF APIClient

Hey all, I have a large passing test suite that doesn't seem to get along with pytest-xdist.

The status code responses from the Django Rest Framework test APIClient suddenly all become 403 errors.

The client uses a fixture for the user that is being supplied for authentication. There is no higher scoping given to anything (e.g. no session, module, etc scoping).

Are there any known problems that I'm missing here?

Versions:

django==3.2.9
pytest==6.2.5
pytest-django==4.4.0
pytest-xdist==2.4.0

From pytest runs:

platform darwin -- Python 3.8.1, pytest-6.2.5, py-1.11.0, pluggy-1.0.0
plugins: asyncio-0.16.0, django-4.3.0, xdist-2.4.0, forked-1.3.0

Start by reproducing the 403 responses with the listed Django, pytest, pytest-django, and pytest-xdist versions, comparing normal and xdist runs. Inspect the DRF APIClient authentication fixture and pytest-xdist interaction; done means identifying a reproducible cause and documenting or fixing the behavior with a regression test.