[vhbit]

And the reason was invalid /boot/loader.conf:

console="vidconsole,comconsole" autoboot_delay="10" console="comconsole,vidconsole" autoboot_delay="1"

Second console actually disables access from web console access, which is fatal.

Autoboot is not critical, although default to 3 sec should work much better for opportunity to change boot options from web console.

[saper]

This got apparently fixed, in my "ams3" instance I've had to issues getting web console to work (needed to "tunefs -n enable /")