macOS: Quick3D item icons "fly" back to the item library after item drag and drop

Steps to reproduce:

1. Create a project
2. Import Quick3D
3. Drag and drop some Quick3D item, for example a sphere, to the 3D Editor
4. After the drop, sphere icon 'flies' back to the item library. For a user this action might give the impression that dropping the item did not succeed. Adding for example a rectangle to a Form Editor does not behave the same.