We're working to fix this! In the meantime, if you'd like to create a custom thumbnail that should fix the issue (as we don't think custom thumbs are impacted). We'll let you know once it's resolved.
@TeamYouTube why is my thumbnail broken? This is clearly not the thumbnail I set, and trying to change it fixes nothing.pic.twitter.com/hs9gh0Nmz9
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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