It was a brief experiment and is not being conducted anymore. However, we'd like to take a look. Does this happen across devices? Also, mind sharing a few screenshots of the issue for us to investigate further? Thanks!
Hmm @TeamYouTube, the last 4 videos I've uploaded haven't shown my Custom Thumbnails, am I still a part of that experimental @YouTube Program to test Thumbnails?
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It is, both on my PC and Phone I’m seeing thispic.twitter.com/m81EfuQeWK
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