Last modified: 2012-11-30 16:20:27 UTC
* http://wikivoyage.com/?a=b%20c&+d * http://www.wikivoyage.org/?a=b%2520c&+d * http://www.wikivoyage.com/?a=b%2520c&+d * http://www.wikivoyage.org/?a=b%252520c&+d * etc. We had this a while ago on some other domain as well (commons.wikipedia -> commons.wikimedia iirc).
I think this is being fixed in Gerrit change #34113 *** This bug has been marked as a duplicate of bug 20409 ***