Adding User Assets to project with old project structure does not work properly

Steps to reproduce:

• Create a project with QDS4.6 and save a material, 3D components (imported and primitive) and texture to User Assets
• Close the project
• Open the attached project (having old project structure)
• In User Assets try adding material, 3D components and texture to the project
• -> Material and 3D components are not added. Texture cannot be added as image, but adding as texture seems to work