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The root cause was introduced in PY-23540 (see cb598c94c5).
Namely, abs.ABCMeta was explicitly filtered out from the list of metaclasses in
`PyClassImpl.getMostDerivedClassType` because for some reason in Typeshed stubs for
Python 2 `basestring`, and hence `str`, uses `ABCMeta` as its metaclass,
which is not true at runtime. It caused a metaclass conflict when inheriting `str`
with another user-defined metaclass (`ABCMeta` and a user metaclass didn't extend
each other), so we didn't detect any metaclass in a class as a result.
I've updated Typeshed stubs for Python 2 manually to process ABCMeta normally.
We don't update these stubs anyway, so these changes won't be lost on a future
Typeshed sync.
GitOrigin-RevId: 680e9fa890d00ea63987f3cf73e636e430685f34