When deleting/creating Scene3DViews dynamically, then it is possible that the rendering of objects inside the scene are not rendered correctly in terms of depth

When deleting/creating Scene3DViews dynamically, then it is possible that the rendering of objects inside the scene are not rendered correctly in terms of depth.

In the example, when it is started then some of the scenes are correct, when the torus goes to the back behind the ring, then it is not rendering the torus at all. However in some of the scene3dviews then the torus is still visible (typically #3 in the view shows this). When changing the number of views to be just 2 then suddendly the torus is always rendered at the front, going down to 1 and then 2 again makes it go to the back.