Imported types for arguments before positional-only marker reported unused

Steps to reproduce

from typing import AnyStr, Set
def func(arg: AnyStr, /, arg2: Set[str]):
    pass

Current behavior

example.py:1:0: W0611: Unused AnyStr imported from typing (unused-import)

Expected behavior

No warning shown

pylint --version output

pylint 2.4.4
astroid 2.3.3
Python 3.8.1 (tags/v3.8.1:1b293b6, Dec 18 2019, 23:11:46) [MSC v.1916 64 bit (AMD64)]