See r16967. Rainman said another maintainer should take it, so this bug is filed.

My comment in Code Review:

The line "if($vCode==$wgContLang->getCode()) continue; // we don't want default variant" doesn't work correctly on zhwiki (and other wikis with $wgLanguageCode = 'zh'), where the language code 'zh' is also used as a variant name (which means 'no conversion'; technically it's a variant). Omitting zh variant causes /zh/Page_Name urls (when $wgArticlePath = '/$2/$1') not to be purged.

Version: 1.17.x
Severity: enhancement