PySide6/Shiboken overrides standard library enum.

import enum
class MyEnum(enum.Enum):
    MEMBER = 0
print(f"{isinstance(MyEnum.MEMBER, enum.Enum)=}")
import PySide6
print(f"{PySide6.__version__=}")
print(f"{isinstance(MyEnum.MEMBER, enum.Enum)=}")
import enum
print(f"{isinstance(MyEnum.MEMBER, enum.Enum)=}")
-----------OUTPUT--------------
isinstance(MyEnum.MEMBER, enum.Enum)=True
PySide6.__version__='6.3.2'
isinstance(MyEnum.MEMBER, enum.Enum)=True
isinstance(MyEnum.MEMBER, enum.Enum)=False