Thread:Project:Support desk/enabled canonical urls in 1.19/reply (7)

Because the latter is a redirect page, where the former is not. MW by default (without any extension) only puts the canonical link tags on pages which aren't the canonical version (For example http://thepetwiki.com/index.php?title=European_Shorthair is canonically http://thepetwiki.com/index.php?title=British_Shorthair )