Incompatible type when using `Self`

[last-partizan]

Describe the Bug

This is happening in django with django-types, but minimal reproduction is independent:

from typing import ClassVar, Generic, Self, TypeVar, reveal_type

MT = TypeVar("MT", bound="Model")

class Manager(Generic[MT]):
    def get(self) -> MT: ...

class Model:
    objects: ClassVar[Manager[Self]]

class UserProfile(Model):
    ...

def get_user_profile() -> UserProfile:
    v = UserProfile.objects.get()
    reveal_type(v)
    return v

 INFO revealed type: Self@Model [reveal-type]
  --> /tmp/test.py:16:16
   |
16 |     reveal_type(v)
   |                ---
   |
ERROR Returned type `Self@Model` is not assignable to declared return type `UserProfile` [bad-return]
  --> /tmp/test.py:17:12
   |
17 |     return v
   |            ^
   |
 INFO 1 error

Sandbox Link

https://pyrefly.org/sandbox/?code=GYJw9gtgBALgngBwJYDsDmUkQWEMoDCANgIYDOZAaiSADRQDiApikyEgMb0DKTRw9ACqIm1OlBBMAbkxJEA%2BvARMAUCoCygqAF4ow5WIAUAIk3H6AIzABXFABNtpsHb7GAlGo6kKUdSRQkaGyGzKzsHADamgC6bgBcKlBJUC7AUEEwhmR8wG5QALQAfL6CcVAAdJWe3mS%2BznwJyVBgFgBWTBwwZGXE5FQ0Uf6BbBG8-NHR1X1QAKrZIAAK4MBIREyG6vVE8YnJleVqqelMMPLW8-IIy6vreUWz80tgK2uNyVI6D2xPL0zlLe1OmRyhlDB4mpIZHJFCJDFJwclJDBrCAUFApEA&version=3.12

(Only applicable for extension issues) IDE Information

No response