Diff: https://zh.wikipedia.org/w/index.php?oldid=67377850&diff=67389059&diffmode=source
I think that's why sysops blocked IABot on zhwiki, caused "CS1 maint: unrecognized language".
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Totally wrong, the user added zh-Hant-TW by him/her self
https://zh.wikipedia.org/w/index.php?title=2021%E5%B9%B4%E4%B8%AD%E5%9B%BD%E5%A4%A7%E9%99%86&diff=prev&oldid=67375052