Last modified: 2011-10-06 18:10:19 UTC
Go to the raw edit mode of your watchlist, and you'll see HTML entities for certain page titles. i.e. Wikipedia:Centralized discussion/Deprecating "Future" templates instead of Wikipedia:Centralized discussion/Deprecating "Future" templates
Original report: https://secure.wikimedia.org/wikipedia/en/w/index.php?title=Wikipedia:Village_pump_%28technical%29&oldid=454251696#Special:EditWatchlist.2Fraw
Confirmed on trunk, taking a quick peek.
Fixed in r99126: double-escaping was introduced during refactoring in r84718