Time not frozen on class

[mblayman]

My team is trying to upgrade from 0.3.0.post1 to 0.4.2. With that being the only change, some of tests start to fail with time related issues. I probably can't share too much of the code, but the interesting characteristics are that the mark is added to the class and there is a fixture within the class that the failing test uses. Here's the start fo the test case:

@pytest.mark.freeze_time("2020-04-01")
class TestMDProviderAvailability:
    @pytest.fixture()
    def scheduled_provider(self):
        now = timezone.now()
        shift_start = datetime(
            year=now.year, month=now.month, day=now.day, hour=8, minute=0, microsecond=0, tzinfo=timezone.utc
        )
        return ScheduledDoctorFactory(shift=shift_start)

We have also noticed the same problem on 0.4.1 so this behavior is not new 0.4.2. Could there be some issue with the freeze_time mark not applying to the nest fixture or something? Any thoughts about what might be going on? I can try to provide more data if this isn't enough to go on.