CustomMaterials (both types) don't work when used in this manner:
But do work when used inline of the View3D. This is likely because CustomMaterials reference the scenemanager attached to a View3D, but this isn't actually a very unusual usecase so it should be able to work.
|For Gerrit Dashboard: QTBUG-87020|
|316138,3||Prevent that importSceneManager's renderContextInterface is nullptr||dev||qt/qtquick3d||Status: MERGED||+2||0|