can't able to infer type of classmethod when type parameter is used

[KotlinIsland]

from typing import *

T = TypeVar("T")

class A(Generic[T]):
    @classmethod
    def f(cls, t: T) -> None:
        print("hi")

a = A.f(1)  # Type of "f" is partially unknown
              #   Type of "f" is "(t: Unknown) -> None"  (reportUnknownMemberType)