This issue derives from #14455 (comment).

[copied from other issue] Meanwhile, upon checking the Python documentation, it turns out that only when subscribed by typing.ClassVar is an annotate variable considered a class variable. Copied from the above-mentioned documentation:

class Starship:
    stats: ClassVar[dict[str, int]] = {} # class variable
    damage: int = 10                     # instance variable

What I had as an example in the original post is therefore an instance variable, not a class variable. This contradicts the discussion in PyCQA/flake8-bugbear#293, which only has to do with typing.ClassVar.