QParallelAnimationGroup duration cant be set via ctor.

Setting all properties via ctor still not perfect in 6.5.1. Most work, but seems as if there are still exceptions.

This here works in PyQt, but not PySide.

from PySide6.QtCore import QParallelAnimationGroup

# duration is a property of QParallelAnimationGroup
assert QParallelAnimationGroup.staticMetaObject.property(6).name() == "duration"

QParallelAnimationGroup(duration=100)  # but this still fails

Seems somehow special to "duration" property, dont know why....