On the newly created banwiki (T234768), many pages containing "[[Kategori:…]]" links are not listed in the categories themselves. I assume this was caused by having its content imported before the wiki was properly configured to recognize "[[Kategori:…]]" as equivalent to "[[Category:…]]".
I don't believe this is a current configuration issue (hence not tagging this as a site request) because the problem can be fixed for individual pages by performing null edits on them.
But since there are over 1,800 pages on the wiki, it would be nice if this could get fixed all at once by running a maintenance script. I believe 'refreshLinks.php' is the script that is called for.
I also have significant doubt about the current article count shown on the wiki (168, but it looks to me like about half of the 1,160 main-namespace pages have wikilinks on them), so after running 'refreshLinks.php', please also run 'updateArticleCount.php'.