English or Chinese characters will both trigger this bug, I observed multiple style change in console, I think it may due to auto-translator. I advise we adjust the input box only if the characters exceed the size of box, rather than make change each time user input something.
The page when I found this issue: https://zh.wikipedia.org/w/index.php?title=Special:%E5%86%85%E5%AE%B9%E7%BF%BB%E8%AF%91&page=2020+United+States+federal+government+data+breach&from=en&to=zh&targettitle=2020%E5%B9%B4%E7%BE%8E%E5%9B%BD%E8%81%94%E9%82%A6%E6%94%BF%E5%BA%9C%E6%95%B0%E6%8D%AE%E6%B3%84%E9%9C%B2%E4%BA%8B%E4%BB%B6
(Or you can just try to create a English to Chinese translation task on page "https://en.wikipedia.org/wiki/2020_United_States_federal_government_data_breach")
If you need me to debug, and I did not reply in time, please email me or go to wikipedia(either en,wiki or zh,wiki) and leave message in Talk:Jack.A.Black
Much Thx