The use of /stand/sysinstall to do a live upgrade has always been discouraged, though it's not outright disallowed since I believe in every man's right to blow his feet off if he really wants to.
Nonetheless, for the expected installation experience one is encouraged to boot the desired OS release's installation media and select an upgrade instead of a new install. - Jordan To Unsubscribe: send mail to majord...@freebsd.org with "unsubscribe freebsd-hackers" in the body of the message