Fixture django_db_setup stopped working when upgrading from 4.6 to 4.7

I've been using a custom django_db_setup fixture which has worked for years. After upgrading from 4.6 to 4.7 this suddenly doesn't work anymore, resulting in the following error:

RuntimeError: Database access not allowed, use the "django_db" mark, or the "db" or "transactional_db" fixtures to enable it.

This might be a bug. Anybody any idea how to fix this from 4.7?
The fixture is something like this:

@pytest.yield_fixture(scope="session", autouse=True)
def django_db_setup(django_db_blocker):
    with django_db_blocker.unblock():
        # Code that requires DB access and populates data required for all tests.
        Model.objects.create()

        # At this point the DB setup for the tests is complete
        yield

Start with the custom session-scoped django_db_setup fixture shown in the report and compare its behavior on versions 4.6 and 4.7, focusing on django_db_blocker.unblock(). Confirm the expected database-access behavior during setup, then capture a regression test or migration guidance once the cause is established.