No fixtures created when running with xdist

I have a class based test architecture. When I'm running py.test some/test/file.py, I get green tests. But once I run passing -n 2 with xdist, then for some reason my fixtures are not created.

class BaseTest(object):
    fixtures = ['fixture-file.json']

class Test(BaseTest, TestCase):
    def test_something():
        # At this point no fixtures is loaded if we're in an xdist process

Any idea if that's a bug or if something I'm doing might be confusing the system?

(I know the architecture described here is not ideal. But I'm working on a fairly large legacy code base.)

Reproduce the report using py.test some/test/file.py and the same command with -n 2, starting from the class-based setup in some/test/file.py with BaseTest.fixtures and Test. Compare fixture availability in the xdist process; done means the reported fixture is created and loaded consistently in both runs.