https://bugzilla.wikimedia.org/show_bug.cgi?id=55317
--- Comment #1 from Kunal Mehta (Legoktm) legoktm.wikipedia@gmail.com --- It has to do with the zh-traditional/zh-simplified distinction. In normal MediaWiki usage, both the simplified and the traditional orthography of Chinese work, but the bot uses [[Special:Export]], which only works for simplified Chinese.
If you change the link from [[zh:倩女离魂]] to [[zh:倩女離魂]], you still go to the same page, but the link will work for the bot as well.