Board Thread:Support Requests - Getting Technical/@comment-27101389-20190317015903/@comment-27101389-20190321033537

Looking at the page history, Category:Concept Art was first created on August 7, 2018 by an admin. I talked to that person about it, and they said that they created the redirect back then because of these "invisible" items that were causing the category to be listed in Special:WantedCategories. In other words, this has been an issue since before December 30. Odd that there was no reference to the category in the database dump, nor were any results returned from Fngplg's API query.

But this isn't a unique case on the wiki. Something similar is going on with Category:Scrapped, which has been dealt with in the same way as Category:Concept Art (that is, making the category page a redirect). Also, outside of the category namespace, we have this page that is supposedly being linked to from somewhere else (we know this because, when we deleted the page, it showed up in WantedPages with "1 link"). Again, we've dealt with it by making the page a redirect.