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Part of the issue 19030 patch was incorrect and we missed it in the review. Specifically, the else clause in this bit:
 try:
 get_obj = getattr(cls, name)
 except Exception as exc:
 pass
 else:
 homecls = getattr(get_obj, "__class__")
 homecls = getattr(get_obj, "__objclass__", homecls)
 if homecls not in possible_bases:
 # if the resulting object does not live somewhere in the
 # mro, drop it and go with the dict_obj version only
 homecls = None
 get_obj = sentinel
The restriction that the __class__ of the object returned by a descriptor must appear in the MRO doesn't make any sense. The entire else block should be simplified to just:
 homecls = getattr(get_obj, "__objclass__", None)
And a "defining class" of None should be documented as a possible result for dynamic attributes that appear in __dir__ but don't set __objclass__ appropriately, and don't correspond to a descriptor.