Issues in adding Content Library materials and effects to a project

There seems to be some issues in adding Content Library materials to a project. When testing, I ended up with few different outcomes after trying to add an instance of the material to the project. Steps:

• Start DS
• Create a general empty project
• Add QtQuick3D module
• In Content Library, download some materials
• Right click a material and choose "Add instance..."
  • Outcome 1: Material is added (seen in Material Browser), but materialLibrary component in Navigator shows "Item could not be created" error
  • Outcome 2: Material is not added and Material Browser, Content library, Texture editor and Material Editor freeze. There's also "Anchor line expected. (M9) error seen for Text component in Code View.
  • Outcome 3: Material is not added, after a while I can see "Error rewriting document" error
  • Outcome 4: Everything works as expected, without any issues.

Please see attached pictures. Tested with latest 4.3.2 snapshot on Windows. 

This method also causes the bugs to appear:

• Start DS
• Create a general empty project
• Add QtQuick3D module
• Add view3D to the rectangle
• In Content Library, download some materials
• Add the material from Content Library from "Add instance" button or from right-click -> "Add instance"