Reproduces in master based snapshots. Steps to reproduce:

• Import some 3D assets to a project
• Double click 3D component in Components view to go inside the component
• Import some other 3D asset to the project
• Return to Screen01.ui.qml file, save changes if asked
• Click + in Components view
• -> Imported 3D assets should be shown in the list as Quick3DAssets.component but it's not
• Close/reopen the project
• Click + in Components view
• -> 3D asset is now in the list and you can add it