It seems transcodes are not deleted after deleting the corresponding file.
See: https://upload.wikimedia.org/wikipedia/commons/transcoded/7/72/Ainomamade.wav/Ainomamade.wav.ogg
& https://upload.wikimedia.org/wikipedia/commons/transcoded/f/fa/Virus_de_Amor_-_Dejame_PRIMICIA_2013.wav/Virus_de_Amor_-_Dejame_PRIMICIA_2013.wav.ogg
(both deleted because of copyright violation)
Version: unspecified
Severity: normal
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=54106