With ruff==0.2.1 and Python 3.12:

from enum import Enum

class MyEnum(Enum):
    pass

class CustomStrEnum(str, MyEnum):  # Throws SLOT000
    pass

I think this is a false positive for SLOT000 based on #5748. At the time, looks like Ruff decided not to check for this.

However, maybe nowadays it's possible, and it is a false positive SLOT000. Do you think we can fix this false positive