When translating "Uma Thurman" from English to Catalan in production, Content Translation finds one category to be available in both languages ("Living people"/"persones vives").

However, when the article is published, the category code is added as text instead of the category being properly added as a category.

I published the article under my user namespace (not sure if the result would be different if published in the main namespace). Note the <nowiki> marks around the [[Categoria:Persones vives]] code:

Another issue (not sure if related) is the addition of categories such as Articles with hCards that were not shown in Content Translation.