Steps to Reproduce:
Am on a campaign (https://tools.wmflabs.org/isa/campaigns/2)
Get this image displayed : https://commons.wikimedia.org/wiki/File:01332-Zottewitz-1899-Schloß-Brück_%26_Sohn_Kunstverlag.jpg
I look at "categories" area. I notice the cc0 category. On the commons page, it is a hidden category
Actual Results:
Displays a hidden category
Expected Results:
Should probably not display hidden categories (unless there is a good argument in favor ?)