User blog comment:DaNASCAT/Technical Update: July 29, 2015/@comment-1398253-20150730114314/@comment-2093602-20150730120633

Odd, I don't remember the links being broken in the recent activity box. I do know the links have been broken for a long time on Search results, though (which is a pain when trying to search eg. the Forums).

Somewhat unrelated, I just realized clicking the search button no longer goes to Special:Search either :|