User blog comment:DaNASCAT/Technical Update: August 17, 2015/@comment-1474707-20150818092802/@comment-11733175-20150818212413

I reported a similar issue with certain special pages not updating, which uses the same method to update as template transclusions. Turns out because one wiki altered a template with 600k uses said system got a bit overloaded. Either way, the appropriate team is aware and looking to fix the issue.