Steps to replicate the issue:
Translate a page which includes an infobox template, from Norwegian Bokmal to English using the desktop editor, in Norwegian (no) wiki.
Check categories are correct
Publish page
What happens?:
Hidden categories that are included in the Norwegian infobox template are added to the target page wikitext, although they are not visible during the translation inside neither the source nor the target content.
What should have happened instead?:
They shouldn't have been added at all.
Other information:
Examples:
https://en.wikipedia.org/w/index.php?title=Selma_Ibrahim&direction=prev&oldid=1156992277
https://en.wikipedia.org/w/index.php?title=Siri_Kalvig&oldid=1157159580
I've found that it happens on every browser, I've tested Brave, Safari, and Chrome. I'm running Windows 11. I have cleared the cache multiple times.