This example started generating a false positive about an undefined name (simplified from a real-world generated protobuf stubs):

from typing import NewType

class W[T]: pass

class R:
    class M(W[Action.V], type):  # Name "Action.V" is not defined
        FOO = R.Action.V(0)
    class Action(metaclass=M):
        V = NewType('V', int)

class Action:
    pass

This was a side effect of #18625.

There may be some confusion between R.Action and Action classes.

This looks like a release blocker. This is happening in generated protobuf stubs code which can't be edited easily.

If this is non-trivial to fix, we could temporarily revert the original PR until a fix is available.

cc @ilevkivskyi as the author of the above PR