**Steps to replicate the issue** (include links if applicable):
* Go to https://zh.wikipedia.org/wiki/Special:RecentChanges?tagfilter=visualeditor
* Find some edits with large content addition
(Feel free to replace this with a real reproduction)
Example revisions:
[91676183](https://zh.wikipedia.org/w/index.php?title=2026年地方公職人員選舉民主進步黨提名結果列表&diff=prev&oldid=91676183&diffonly=1), [91681581](https://zh.wikipedia.org/w/index.php?title=2026年地方公職人員選舉民主進步黨提名結果列表&diff=prev&oldid=91681581&diffonly=1), [91681790](https://zh.wikipedia.org/w/index.php?title=九段线&diff=prev&oldid=91681790&diffonly=1), [91681746](https://zh.wikipedia.org/w/index.php?title=南唐&diff=prev&oldid=91681746&diffonly=1), [91681228](https://zh.wikipedia.org/w/index.php?title=游荡弹药&diff=prev&oldid=91681228&diffonly=1), [91680448](https://zh.wikipedia.org/w/index.php?title=MF_GHOST&diff=prev&oldid=91680448&diffonly=1), [91682546](https://zh.wikipedia.org/w/index.php?title=SMG戰隊&diff=prev&oldid=91682546&diffonly=1), [91682559](https://zh.wikipedia.org/w/index.php?title=TXO戰隊&diff=prev&oldid=91682559&diffonly=1), [91681679](https://zh.wikipedia.org/w/index.php?title=性交体位&diff=prev&oldid=91681679&diffonly=1), [91683678](https://zh.wikipedia.org/w/index.php?title=性交&diff=prev&oldid=91683678&diffonly=1), [91686264](https://zh.wikipedia.org/w/index.php?title=中法战争&diff=prev&oldid=91686264&diffonly=1)
**What happens?**:
LanguageConverter tags (`-{}-`) are sometimes sprinkled in the wikitext diff. It started with deployment of 1.46.0-wmf.17 to group2 wikis. I suspect it's related to {T380517}.
A user suspect it results from pasting content to the VE ([link](https://zh.wikipedia.org/wiki/Wikipedia:互助客栈/求助#編輯Bug)).
**What should have happened instead?**:
These ugly diffs should not happen.
**Software version**: 1.46.0-wmf.17
**Other information** (browser name/version, screenshots, etc.):
Should this be a subtask of {T413808} or {T418006}?