Bug report

The following snippet has a different output on Python 3.11.0b3 than on <= 3.10:

import enum

class StrMixin:
    def __str__(self):
        return f"__str__ from {self.__class__.__name__} {self.value}"

class MyEnumTuple(tuple, StrMixin, enum.Enum):
	FIELD = (1, 0)

x = MyEnumTuple((1, 0))
print(x)

On 3.10 and earlier it outputs:

__str__ from EnumMixin (1, 0)

On 3.11.0b3 it outputs this:

MyEnumTuple.FIELD

My environment

• CPython versions tested on: 3.11.0b3, 3.10.1, 3.9.7
• Operating system and architecture: macOS 10.15.7, x86_64