I'm using Web Appbuilder Dev Ed v2.2, and am having an issue with the basemap thumbnails disappearing from \server\apps\*\configs\BasemapGallery whenever I edit and save an app. I am using custom basemap selections from a Group because I only want a few. Copying and pasting the thumbnails is getting a bit frustrating, and I'm sure this is not intended behavior.
I did not encounter this issue with prior versions of the Web Appbuilder.
Has anyone else come across this and found a solution?