Issue with alias properties

Steps to reproduce:

• Import the attached 3D asset to a project
• Drag it to scene
• Go into 3D component file
• Add some alias properties:

    property alias defaultMaterial_materialBaseColor: defaultMaterial_material.baseColor
    property alias defaultMaterial_materialRoughness: defaultMaterial_material.roughness
    property alias rootNodeVisible: rootNode.visible

• Go back to Screen01.ui.qml file
• Select Box component
• -> In Exposed custom properties it is expected to see:
  
• Insted, there is
  

• So only nodeVisible is correct, material roughness is missing and material basecolor is not shown correctly
• This was working correctly in 4.7.2 snapshot we tested June 2nd