setting the console to serial by defailt seems to not work

Hi,

I have an rpi4 arm64 device at n271321-9ae91f59c500 and an amd64 image
running in screen(8) as zvol-backed vm at n271360-82283cad12a4

The arm64 device is headless and i connect to it via serial.
I noticed the beastie menu come up with the option Video for
console. Cycled it to Serial, booted, all fine.

Rebooted and it's back at Video, which i don't want.

At the time it was inconvenient to reboot that machine again, so
made the amd64 test vm mentioned above. On installation, this was set to Serial
in the beastie menu, rebooted and it remained at Serial. So rebooted again
set it to Video. rebooted again and it had gone back to Serial!

So looked at man 5 loader.conf and set console="vidconsole" and rebooted,
expecting beastie to show Video. It remained as (or gone back to) Serial.

Is this a bug?

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