Sorry, there was a bug in our software that was dropping query strings from wikipedia.org URLs. I've fixed that now. Thanks!
Links to older versions of Wikipedia pages will run into a different problem, though—our software replaces URLs with canonical URLs when it finds them, and it looks like older-version Wikipedia pages point to their current-version equivalent as the canonical URL.
Links to older versions of Wikipedia pages will run into a different problem, though—our software replaces URLs with canonical URLs when it finds them, and it looks like older-version Wikipedia pages point to their current-version equivalent as the canonical URL.
Edit: that latter issue should be fixed now too.