User blog comment:DaNASCAT/Technical Update: August 22, 2016/@comment-1251315-20160823141834

There is a bug with the appreciations button. If you have the "Hide page content below diffs" option enabled in your Special:Preferences, then the button does not appear. I will send in a S:C about it, with a screenshot to confirm, but posting here so other users of Wikia are aware of this particular bug.