Last modified: 2012-04-16 09:16:06 UTC
A <pages> section is expected but it's not there.
I think the documentation at http://www.mediawiki.org/wiki/API:Properties#info_.2F_in just needs to be updated.
Yeah, this is not a bug, just a documentation issue. You've hit a special case of a redirect loop. When the API encounters a redirect loop, it gives up and doesn't output a <page> tag for the redirect target (because there *is* no redirect target in case of a loop).