@TeamYouTube @YTCreators Custom Thumbnails are no longer sticking on my channel. They'll show almost everywhere my end (Studio Beta/Classic) and via links. Sometimes it shows a random thumbnail during edit (not an auto-generated one). Happens since Premieres enabled.
Here's what I see. Thumbnail Selection (notice the thumbnail shown on channel doesn't exist as an option), Channel Page and Video list in Classic.pic.twitter.com/wGGyBoAhMc