Reverting a video to an older version ( https://commons.wikimedia.org/w/index.php?title=File%3ATmh.rev.test.ogv&diff=83339659&oldid=83296596 ) breaks the "thumbnails" ( example: https://upload.wikimedia.org/wikipedia/commons/thumb/1/14/Tmh.rev.test.ogv/Tmh.rev.test.ogv.360p.webm ) and does not trigger a new transcode.
Error message:
Error generating thumbnail
The specified thumbnail parameters are not recognized.
Version: master
Severity: normal
URL: https://commons.wikimedia.org/wiki/File:Tmh.rev.test.ogv
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=29179