I am working on our organization's Basemap Gallery, which basically are a bunch of web maps of imagery that are shared to the Basemap group. These imagery are set as basemap in the web maps. When I use Basemap widget to add the group, there is always a 'ghost' item showing in the gallery. This ghost item (World Topo Map) is not added in our basemap group and it doesn't have proper icon with it. See the attached picture.