Issues with single user mode on FreeBSD-14 and RPi4

Hello, with FreeBSD-14 on Raspberry Pi 4, I am not able to get login
prompt when booting single user mode:

OK boot -s
... kernel loads
Dual Console: Serial Primary, Video Secondary

and the above is the last message, then it sits there, no login prompt,
no response from keyboard.

Any ideas how to resolve this? Is single mode not loading some console
process? I don't have a serial console, instead it is connected to the
first HDMI port. Booting multi user works with no issues though.

Thanks.