Not able to reset django form field initial value

I have a django form with a field defined like this:

    myField = forms.CharField(
        widget=forms.HiddenInput(),
        initial=f"2023-{settings.FIELD_BASE}",
    )

I'm writing a test where I'd like to use @pytest.mark.parametrize to test different values of FIELD_BASE. Something like:

@pytest.mark.parametrize("test_base", ["aa", "bb", "cc"])
def test_bases(self, client, settings, test_base):
    settings.FIELD_BASE = test_base

    response = client.get(reverse(someview))
    assert f'name="myField" value="2023-{test_base}" in response.content

This does not work. My hunch is that it's because initial is set when the module is loaded at the beginning of the test run. So I tried reloading, adding the two lines after the settings update:

    settings.FIELD_BASE = test_base
    import importlib
    importlib.reload('myapp.forms')

Still no luck.

Any thoughts on how to handle this?

Start with the form definition in myapp.forms and the parametrized test_bases case shown in the issue; reproduce the behavior after changing settings.FIELD_BASE. Done means identifying and documenting a supported way to test the field's initial value, or establishing a minimal project change if the behavior is a pytest-django bug.