Materials not created when adding view3d, basic models, imported 3d assets

Steps to reproduce:

• Launch DS
• Create new general empty project, target qt 6.3
• Add QtQuick3D
• Drag and drop view3d and sphere to Rectangle in Navigator
• -> Models are not visible in 3D Editor
• -> No materials in Material Browser & Editor
• Import some 3D Asset and go into component file
• -> Material Editor and Browser does not show the materials