The page https://ru.wikipedia.org/wiki/%D0%A8%D0%B2%D0%B8%D0%B4%D0%BA%D0%BE%D0%B2%D1%81%D0%BA%D0%B8%D0%B9,_%D0%94%D0%BC%D0%B8%D1%82%D1%80%D0%B8%D0%B9_%D0%9E%D0%BB%D0%B5%D0%B3%D0%BE%D0%B2%D0%B8%D1%87 is marked as reviewed when it looked by logged-in user, and marked "contains pending changes" when it looked by non-logged-in user.
At the same time last diff https://ru.wikipedia.org/w/index.php?title=%D0%A8%D0%B2%D0%B8%D0%B4%D0%BA%D0%BE%D0%B2%D1%81%D0%BA%D0%B8%D0%B9,_%D0%94%D0%BC%D0%B8%D1%82%D1%80%D0%B8%D0%B9_%D0%9E%D0%BB%D0%B5%D0%B3%D0%BE%D0%B2%D0%B8%D1%87&oldid=74766010&diff=74877326 and last version of this page https://ru.wikipedia.org/w/index.php?title=%D0%A8%D0%B2%D0%B8%D0%B4%D0%BA%D0%BE%D0%B2%D1%81%D0%BA%D0%B8%D0%B9,_%D0%94%D0%BC%D0%B8%D1%82%D1%80%D0%B8%D0%B9_%D0%9E%D0%BB%D0%B5%D0%B3%D0%BE%D0%B2%D0%B8%D1%87&oldid=74877326 are marked as reviewed even if they looked by logged-out user.
Original thread: https://ru.wikipedia.org/wiki/%D0%92%D0%B8%D0%BA%D0%B8%D0%BF%D0%B5%D0%B4%D0%B8%D1%8F:%D0%97%D0%B0%D0%BF%D1%80%D0%BE%D1%81%D1%8B_%D0%BA_%D0%B0%D0%B4%D0%BC%D0%B8%D0%BD%D0%B8%D1%81%D1%82%D1%80%D0%B0%D1%82%D0%BE%D1%80%D0%B0%D0%BC_%D0%BF%D0%BE_%D1%82%D0%B5%D1%85%D0%BD%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%B8%D0%BC_%D0%B2%D0%BE%D0%BF%D1%80%D0%BE%D1%81%D0%B0%D0%BC#.D0.9D.D0.B5_.D0.BF.D0.BE.D0.BA.D0.B0.D0.B7.D1.8B.D0.B2.D0.B0.D0.B5.D1.82_.D0.BF.D0.B0.D1.82.D1.80.D1.83.D0.BB.D0.B8.D1.80.D0.BE.D0.B2.D0.B0.D0.BD.D0.B8.D0.B5