Adding asset to User Assets in old project structure project does not work correctly

Steps to reproduce:

• Open the attached project (having old project structure) with QDS4.6
• Import some 3D asset to project and add to scene
• Import some image file
• Add material, imported 3d component, cube and image to User Assets
• Close the project and create new project with QDS4.6
• Add User Assets to the project
• -> Material, imported 3D component and cube cannot be added
• Adding texture as image, texture and light probe seems to work