When trying to upload a tvOS archive to iTunesConnect, I get the following error:
Invalid Image Asset. The image asset 'App Icon - Small' in 'Payload/[APPNAME].app' has an invalid scale value of '3'. Home Screen Icon assets are allowed scale values of ( "1" )."
I assume this problem will occur for the 'App Icon - Large' as well once I fix the small icon.
The layers of my stacked image icon were vector PDFs. Converting these layers to static PNG format at a 1x scale solved the problem.