User blog comment:DaNASCAT/Technical Update: May 6, 2015/@comment-5558012-20150506182506/@comment-732150-20150507162147

Something I noticed that appears to extend to those special pages, is that they don't register some ways images are inserted in articles. For example, in the Narutopedia, articles that have images in them via templates or tab viewers (don't know if that's the name), they show up in the withoutimages special page.