using meshNodes duplicates the whole mesh

If referencing a mesh-node via the Item3D meshNode property it seams the whole mesh will be drawn twice.

If you set an effect it only effects the mesh-node, but if you do any geometry-manipulation (scale, rot, translate) the whole model is drawn a second time (geometry changed).
As performance changes significantly if you reference any mesh-node (even non existing mesh-nodes!!) I assume this is happening always and only visible if geometry-manipulations are applied.

I've attached a simple example showing this.

My source:
Qt 4.8 (0f10e3603fc5f24ebd3773cb2976d0bb24fcbd17)
Quick3D (d8d8358f7cbd698436ea1ab209c488d538d84650)