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).