Bug report

Bug description:

importdataclasses@dataclasses.dataclassclassNotFrozen:pass@dataclasses.dataclass(frozen=True)classFrozen:pass@dataclasses.dataclass(frozen=True)classChild(NotFrozen,Frozen):pass

The dataclass inheritance hierarchy is supposed to require all classes to be either frozen or non frozen, this works properly for checking that an unfrozen class does not inherit from any frozen classes, but it allows frozen classes to inherit from unfrozen ones as long as there's at least one frozen class in the MI

CPython versions tested on:

3.10

Operating systems tested on:

Windows

Linked PRs

• gh-109409: Fix inheritance of frozen dataclass from non-frozen dataclass mixins #109437