Sorting for transparent nodes seems to fail

Does not seem to occur in Qt 6.1.1.

Attached example seems to somehow sort Item nodes wrong so that closer to the camera is getting rendered before the one behind and thus the underlying object is not visible through the transparent region (see the screenshot). This only seems to occur if there is also an opaque object in the scene and the camera has right angle (= I can only see this if x rotation is <= -5).