Flag inequality gives wrong result when flag object is compared to itself

When storing a combination of flag in a python variable, comparing the flag object to itself gives wrong results with the inequality operator (!=). Interestingly, this only fails with combinations (from my limited tests anyway). More interesting, if you store an equal flag value in a second variable and use that for comparison with the first variable, all is well.

Code to reproduce:

from PySide6 import QtCore

if __name__ == '__main__':
    f = QtCore.Qt.AlignHCenter | QtCore.Qt.AlignBottom
    print('f is f:', f is f)
    # True
    print('f == f:', f == f)
    # True
    print('f != f:', f != f)
    # True -> wrong

    g = QtCore.Qt.AlignHCenter | QtCore.Qt.AlignBottom
    print('f == g:', f == g)
    # True
    print('f != g:', f != g)
    # False