1.1.408 regression: class instances with a custom metaclass are treated as types

[Viicos]

Code sample in pyright playground

class Meta(type):
    pass

class A(metaclass=Meta):  # Remove metaclass to observe the correct behavior
    pass

def func(a: A):
    # The goto definition also goes to type.__dict__, not object.__dict__
    reveal_type(a.__dict__)  # MappingProxyType[str, Any] with metaclass, dict[str, Any] without