mypy doesn't escape typevars from generics in self-type

Bug Report

Passing a callable to another which matches the typevar with another typevar doesn't allow passing them into the return type. (if that makes no sense, the reproducer below is simple)

To Reproduce

from typing import Generic, TypeVar, Callable

T = TypeVar("T")
V = TypeVar("V")

class X(Generic[T]):
    def f(self: X[Callable[[V], None]]) -> Callable[[V], V]:
        def inner_f(v: V) -> V:
            return v

        return inner_f

reveal_type(X[Callable[[T], None]]().f())  # N: Revealed type is "def (Never) -> Never"
# ^ this should keep the generic

Expected Behavior

I don't expect a Never.

Your Environment

Checked on mypy playground.

• Mypy version used: v1.14
• Mypy command-line flags: --strict
• Mypy configuration options from mypy.ini (and other config files): N/A
• Python version used: 3.12

Führe zunächst den bereitgestellten generischen Self-Type-Reproducer unter mypy v1.14 mit --strict aus und untersuche, wie reveal_type XCallable[[T], None].f() auflöst. Verfolge den für das Ergebnis verantwortlichen Typinferenzpfad und betrachte das Issue als abgeschlossen, wenn die zurückgegebene Callable ihren generischen Typ beibehält, statt zu (Never) -> Never zu werden.