Join phrase cleanup not running

Typing "ft" on a join phrase field used to trigger an autoclean to make it " feat. " as per guidelines, but that has stopped working for some reason.

Edit: more globally, it seems all of joinChanged has stopped working: https://github.com/metabrainz/musicbrainz-server/blob/65f54a1247f0c1003b7dc9cc0a47b96463b97794/root/static/scripts/edit/MB/Control/ArtistCredit.js#L54