linter problem

I have a module with something like the following code:

# my_module.py
@dataclass(frozen=True)
class MyClass:
    field_1: float
    field_2: float
    field_3: Optional[list[float]] = None
    
def my_function() -> MyClass:
    # Do some stuff
    return MyClass(1.0, 2.0, field_3=[1, 2, 3])

I have a test:

# my_test.py
def test_my_function():
    my_class = my_function()
    
    assert my_class.field_1 == 1.0
    assert my_class.field_2 == 2.0
    assert all(a == e for a, e in zip(my_class.field_3, [1, 2, 3]))
    # All of the assert statements issue the following warning:
    # Unresolved attribute reference 'field_X' for class or class '(MyClass, Any, Any, Any, Any, Any, Any, Any, Any, Any, Any, Any, Any, Any, Any, Any, Any, Any, Any, Any, Any, Any)' 

At some point I hand initially defined MyClass as a collections.namedtuple. I changed my mind and switched to a typing.NamedTuple for type support. I was getting the same warnings with typing.NamedTuple, so I thought I'd try using a @dataclass to resolve the warnings. It sort of seems like PyCharm still thinks its a collections.namedtuple with the wrong set of attributes.

I have tried running File > Repair IDE several times, but I continue to get the warning. Is there anything else I can do?