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The C function type_new() creates a copy the dictionary for __dict__ and modifies the copy... except for __qualname__: it does modify the input dictionary before the copy.
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def f(): pass
d = {'__qualname__': 42, '__new__': f}
assert d['__new__'] is f
assert '__qualname__' in d
Enum = type.__new__(type, 'Enum', (), d)
assert d['__new__'] is f
assert '__qualname__' in d
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I don't know if it is expected. If not, the copy should be done before.