Multiple Inheritance segfault on PyPySide

from PySide6 import QtCore

 class Mixin:
     def __init__(self):
         print('Mixin.__init__')

 class Object(QtCore.QObject):
     def __init__(self):
         print('Object.__init__')
         QtCore.QObject.__init__(self)

 class Right(Object, Mixin):
     def __init__(self):
         Object.__init__(self)
         Mixin.__init__(self)

 class Left(Mixin, Object):
     def __init__(self):
         Object.__init__(self)
         Mixin.__init__(self)

 def test_right_mixin():
     x = Right()

 def test_left_mixin():
     x = Left()

 if __name__ == '__main__':
     print('Right')
     Right()
     print('Left')
     Left()
     print('Done')