Sometimes 3D Model's material fields show empty, even though there is id or multiple ids assigned to materials property. Seems to be a case only when the material specified by the id is defined in another qml document in the scene, rather than the material library of the current document.

To repro:

• Open Car Configurator example
• Open MyDoorLeft.qml
• Select root node

-> Material fields are empty.

• Select _materialLibrary_ node
• Select root node

-> Material fields show correct ids.