Thanks for reaching out. We've seen similar reports and are currently looking into it. In the meantime, try re-uploading the thumbnails to see if it's otherwise. Appreciate your patience.
@TeamYouTube When will you fix the thumbnail issue? Without thumbnails we are losing viewers. I’ve just uploaded a video and the most awkward thumbnail is there.
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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