Mypy treating type of final class variable in dataclass as Any

Bug Report

from dataclasses import dataclass
from typing import ClassVar, Final, reveal_type

class Bar: pass

@dataclass
class Foo:
    cv: ClassVar[Final[dict[type[Bar], Foo]]] = {}

reveal_type(Foo.cv)

$ mypy test.py
test.py:10: note: Revealed type is "Any"
Success: no issues found in 1 source file

The correct type of Foo.cv is builtins.dict[type[Bar], Foo].

To Reproduce

https://mypy-play.net/?mypy=latest&python=3.14&gist=2fad4ef5fded90ecaeb0f1d1e59d882a

Expected Behavior

reveal_type should report the correct type for the class variable.

Actual Behavior

reveal_type showed incorrect type (Any).

Your Environment

• Fedora 44
• python3-mypy-1.18.2-4.fc44.noarch (reproducible with Mypy 2.3.1)
• python3-3.14.6-1.fc44.x86_64
• No config files used

issue にある最小の再現例、またはその mypy-play リンクから始め、reveal_type の実行時に dataclass の処理が ClassVar[Final[...]] をどのように扱うかを追跡します。mypy が Foo.cv について dict[type[Bar], Foo] を報告し、その挙動が回帰テストでカバーされれば完了です。