When I create an object w/o ProBuilder and drag it into my assets, it creates the prefab with an icon-picture of the object. When I create an object w/ ProBuilder and drag it into my assets, it just shows the default Unity blue cube icon. Reworded: In my prefabs assets folder, prefabs that are created with a standard 3D game object show pictures of themselves. ProBuilder prefabs are just showing a blue cube. What gives?