Song languages do not appear in ArchivedVersionXml, and are not reverted

[szc126]

Website (required)

VocaDB

Describe the bug (required)

https://beta.vocadb.net/Song/Versions/378784

After a string of edits adding languages, I reverted the entry to an older version that had no languages; the languages stayed.

After checking the "Download XML" (https://beta.vocadb.net/Song/ArchivedVersionXml/) for revisions, I noticed that languages do not appear there either.

To Reproduce (optional)

See above

Checklist (required)

Fill out the checklist. Use ~~strikethroughs~~ or leave fields empty if you don't know or are unable to check/test.

• [x] Searched VocaDB/vocadb for duplicate issues.
• [x] Tested on the beta site.
• [ ] Tested on different browsers (e.g. Firefox, Chrome, Safari, Edge).
• [ ] Checked in private mode.
• [ ] Cleared browser cache and cookies.
• [ ] Checked the DevTools console.
• [ ] Checked the syslog (mods+ only).