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. Will keep you updated, appreciate your patience.
@TeamYouTube Reporting what I've seen about the thumbnail bug. My keyword is "S&box", majority of my videos disappeared from this search result this morning and the few that do show use the wrong thumbnail. Other channels have the wrong thumbnails too.
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Looks like it's back to normal, thank you
End of conversation
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