the query @gmsoft@gentoo.org,hppa@gentoo.org|cc:ipv6@gentoo.org does not return the same result as owner:gmsoft@gentoo.org,hppa@gentoo.org|cc:ipv6@gentoo.org which should be the same according to the documentation on the query page.
I've tried this, not sure what to say, since this is a known upstream bug... gonna close this one, sorry=(