Incorrect type when descriptors are at different levels in the class hierarchy #11401

from typing import assert_type, cast, Any

class AttributeGet[ T ]:
   def __get__( self, instance: Any, owner: Any = None ) -> T:
      return cast( Any, None )

class Attribute[ T, U ]( AttributeGet[ T ] ):
   def __set__( self, instance: Any, object: T | U ) -> None:
      pass

class StrInt( Attribute[ int, str] ):
    pass

class MyContainer:
   si: StrInt

c = MyContainer()
c.si = "2"
assert_type( c.si, int ) # ERROR HERE