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Still seeing this issue with the new Music app. Import an MP3, simply removed the artwork that was already embedded, then the track is corrupted: the last 5% or so of the track is duplicated and appended. The total track length is extended. You can confirm this immediately by using Quicklook.
I find this astounding.
(below post is erroneous, I've reproduced the issue using the "converted" tracks, too)
I've found that by first doing a convert within the Music app for the tracks (convert to MP3 even if they're already MP3) you'll produce a larger MP3 file that is immune to this corruption bug. You can edit artwork of the newly produced MP3 as you'd expect from a 15 year old music management application from one of the largest companies to ever exist: it won't create a different song for you.
The original files in my test case were encoded by iTunes 12.2.2.25.
Okay, stripped artwork from a 'bad' source file using Fission before importing into iTunes/Music. Once this is done, I was able to add artwork in iTunes/Music without corrupting the file. The fix may simply be the result of a re-encode by Fission that corrects pre-existing corruption. The MP3 attributes do reflect that. So if you start with a file with no artwork, try just re-encoding with a trusted third party app first.
Still utterly astounded this isn't a giant bug affecting tons of very audible music collectors.
iTunes and Music corrupt MP3 when editing artwork
