I think that is just the way it is. In my experience, most sim aircraft don’t bother modeling the change in blade angle for a moving prop visually. It’s kind of a waste of time and resources, sort of like modeling every single rivet in the fuselage in 3D.
That’s not to say that there isn’t a demand for that kind of detail, because clearly there is. But I think you probably shouldn’t expect to see it on anything but the most premium aircraft, and even then, it’s a pretty minor detail.