Type-checking generic of enum.Meta with a custom metaclass fails with code that runs, and passes with code that doesn't run.

Bug Report

Trying to type-check generic types of a bound enum.Enum (with a custom metaclass) only catches type errors when the actual code fails to run; but doesn't detect the issues when the code runs.

To Reproduce

The code in this gist properly detects the type error while calling Carrier(Foo, Bar.item1):

import enum
from dataclasses import dataclass
from typing import TypeVar, Generic, Type


M = TypeVar('M', bound="MyEnum")

class Meta(enum.EnumMeta):
    pass

class MyEnum(metaclass=Meta):
    ...

class Foo(enum.Enum, MyEnum):
    item1 = "1"
    item2 = "2"


class Bar(enum.Enum, MyEnum):
    item1 = "1"
    item2 = "2"

@dataclass
class Carrier(Generic[M]):
    meta: Type[M]
    instance: M


Carrier(Foo, Foo.item1)
Carrier(Foo, Bar.item1)  # should fail

However that code fails to run with

Traceback (most recent call last):
  File "/home/manu/src/tmp/enums.py", line 14, in <module>
    class Foo(enum.Enum, MyEnum):
  File "/usr/lib/python3.10/enum.py", line 173, in __prepare__
    member_type, first_enum = metacls._get_mixins_(cls, bases)
  File "/usr/lib/python3.10/enum.py", line 619, in _get_mixins_
    raise TypeError("new enumerations should be created as "
TypeError: new enumerations should be created as `EnumName([mixin_type, ...] [data_type,] enum_type)`

In order for the code to run we have to swap the positions of enum.Enum and MyEnum in both Foo and Bar (see the second gist); but then mypy fails to catch the type-error.

Your Environment

• Mypy version used: master and 0.931
• Mypy command-line flags: none
• Mypy configuration options from mypy.ini (and other config files): none
• Python version used: 3.9
• Operating system and version: Linux pavla 5.15.12-1-MANJARO #1 SMP PREEMPT Wed Dec 29 18:08:07 UTC 2021 x86_64 GNU/Linux

Previous discussion in gitter: https://gitter.im/python/typing?at=61dab43cf5a3947800f73b71

Start by running the two linked mypy-play reproductions with Python 3.9 and mypy master, comparing the version that rejects the invalid Carrier call with the version that runs but accepts it. Then trace mypy's handling of generic enum.Enum subclasses and custom EnumMeta classes, and add regression coverage for the expected type error.