EDIT: could be related to/fixed by #5993?

Describe the bug

error: "SOME_VAR" overrides symbol of same name in class "KlsA"
    Variable is mutable so its type is invariant
      Override type "Literal['bar']" is not the same as base type "str" (reportIncompatibleVariableOverride)

The above error is received for the code provided below where I would expect no error as I narrow the type in a subclass.
Or, am I misunderstanding how I should be narrowing the type for a var that should be set by subclasses and not changed after that point?

from typing import ClassVar, Literal

class KlsA:
    SOME_VAR: ClassVar[str]
    
class KlsB(KlsA):  # error: "SOME_VAR" overrides symbol of same name in class "KlsA"
    SOME_VAR: ClassVar[Literal["bar"]] = "bar"

I checked the same snippet on https://mypy-play.net as a sanity check and it is passing there.

VS Code extension or command-line

command-line

$ npm exec -- pyright --version 
pyright 1.1.328