The first of these causes ty to issue an inconsistent-mro violation; the second one does not:

from typing import Generic, TypeVar

K = TypeVar("K")
V = TypeVar("V")

class Foo(Generic[K, V], dict): ...
class Bar(dict, Generic[K, V]): ...

And issues involving Generic[] are probably some of the most common causes of inconsistent-mro violations in user code. We should offer an autofix that moves the Generic[] element to the end of the bases list, if doing so would fix the inconsistent-mro violation.