Async Patching issue with static methods in Python

I'm having a problem trying to patch a static method, no matter what i've tried the original method is still being ran. I'll illustrate an example below.

file A

import B
from unittest.mock import patch
from unittest import mock
import asynctest
import unittest

class Test(asynctest.TestCase):
    @patch('B.OT._func')
    async def test(self, mock_func):
        mock_func.return_value = mock.MagicMock()
        await B.foo()
        mock_func.assert_called_once()
if __name__ == '__main__':
    unittest.main()

file B

from path.C import OT
  
async def foo():
    print('B')
    return OT._func()

path(folder)/file C

class OT:
    @staticmethod
    def _func():
        print('c')
        return True

Problem

I'm having issues mocking the return value for OT._func(). Whatever I try to patch in file A doesn't stop _func() from running in class B. If the test case is ran it prints out 'c' instead of patching the function. My desired outcome is to patch out _func and have it return something else.

Edit: The issue seems to be with the async portion of the test, if the async is removed it works. A workaround for now is using the context manager version (with keyword) to patch stuff.