pytype difficulties with classmethod

mwe.py

from typing import Generic, List, TypeVar

T = TypeVar('T')

class Container(Generic[T]):
    def __init__(self, x: T):
        self.x = x
    def __repr__(self):
        return f'<Container {self.x}>'


class Thing:
    _things = []  # type: List['Thing']

    def __init__(self, name: str):
        self.name = name
        type(self)._things.append(self)

    @classmethod
    def get(cls, id_: int) -> Container['Thing']:
        return Container(cls._things[id_])

    def __repr__(self):
        return f'<Thing {self.name}>'


if __name__ == '__main__':
    a, b, c = Thing('a'), Thing('b'), Thing('c')
    print(Thing.get(2))

mwe.pyi

# (generated with --quick)

from typing import Any, Generic, TypeVar

a: Thing
b: Thing
c: Thing

T = TypeVar('T')

class Container(Generic[T]):
    x: Any
    def __init__(self, x: T) -> None: ...

class Thing:
    name: str
    def __init__(self, name: str) -> None: ...
    def __repr__(self) -> str: ...
    @classmethod
    def get(cls, id_: int) -> Any: ...