Thanks for reaching out. We've seen similar reports from other users too and are looking into it. In the meantime, could you try re-uploading the thumbnail to see if it helps? Appreciate your patience.
@TeamYouTube I put some effort into creating custom thumbnails for my channel and I sure do not appreciate YouTube removing them!! When will my thumbnails come back? Or have they been removed indefinitely?
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It's not just one thumbnail! It appears to be all of the thumbnails on my channel!
End of conversation
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