On wikis that have crosswiki rights changing enabled for Special:Userrights (especially Wikimedia's meta, office and test wikis), the rights log shows entries like [[User@xxwiki]] which is a red link to a "User@dbwiki" which can never exist (assuming no one registered it before the restriction re "@" was added). I don't really know if it's plausible, but it would be good if the [[User@dbwiki]] would actually link to User on the xx.wiki.org or whatever (an interwiki link).
Version: 1.11.x
Severity: enhancement
URL: http://meta.wikimedia.org/wiki/Special:Log/rights