sysctl debug.kdb.enter=1 but wrong console

Hi,
PXE, NFS root, all nice and shiny, now when cu -s 115200 -l /dev/cuaU0 I see perfectly working console.
But... now when I do sysctl debug.kdb.enter=1 it nicely enters the debugger but only on a physically connected console (+ USB keyboard). It just works there. But...

What I want to achieve though, is to have the debugger running on the ttyU0 (USB <=> RS-232 <=> USB in my case).
Code:
root@:~ # cat /boot/loader.conf
boot_multicons="YES"
boot_serial="YES"
comconsole_speed="115200"
#console="comconsole,efi"
console="comconsole"

TTY configured as:
Code:
ttyU0   "/usr/libexec/getty 3wire.115200"       vt100   on secure

Remark 1. Does not work regardless efi present or not.
Remark 2. For some reason, I need to have both the display + the keyboard attached to the machine. I just want to tell the kernel not to use them for ddb.
 
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