ConsoleKit: cannot activate session after switching

What I have:
- stable/13
- latest packages from pkg.FreeBSD.org
- KDE / plasma
- lightdm

What I did:
- logged in on ttyv8 via lightdm into KDE
- used KDE's "Switch session" function to activate X and lightdm on ttyv9
- logged in as a different use
- locked the session
- switched back to ttyv8 using Ctrl+Alt+F9

Result:
- noticed that auto screen locking and turning off monitors stopped working
- noticed that the ttyv8 session is not active in ck-list-sessions
- tried to activate the session via dbus but that failed

The dbus command:
qdbus-qt5 --system org.freedesktop.ConsoleKit 
/org/freedesktop/ConsoleKit/Session2 org.freedesktop.ConsoleKit.Session.Activate
Error: org.freedesktop.ConsoleKit.Session.Error.General
Unable to activate session

ktrace of console-kit-daemon, note that 9 is passed as a parameter, I would 
expect 8:
   2545 console-kit-daemon CALL  ioctl(0xb,VT_ACTIVATE,0x9)
   2545 console-kit-daemon RET   ioctl -1 errno 25 Inappropriate ioctl for device
   2545 console-kit-daemon CALL  writev(0x2,0x820fbeaa0,0x2)
   2545 console-kit-daemon GIO   fd 2 wrote 96 bytes
        "console-kit-daemon 2545 - - WARNING: Unable to activate console: 
Inappropriate ioctl for device
        "

fstat of console-kit-daemon, note that 11 is a bad file descriptor while 12 is 
for ttyv8:
USER     CMD          PID   FD MOUNT      INUM MODE         SZ|DV R/W
root     console-kit-daemon  2545   11 -         -         bad    -
root     console-kit-daemon  2545   12 /dev        128 crw-------   ttyv8  r

Finally, ck-list-sessions output:
Session2:
         unix-user = '1001'
         realname = 'Andriy Gapon'
         seat = 'Seat1'
         session-type = 'unspecified'
         session-class = 'user'
         session-state = 'online'
         active = FALSE
         x11-display = ':0'
         x11-display-device = '/dev/ttyv8'
         display-device = '/dev/   ?   '
         remote-host-name = ''
         is-local = TRUE
         on-since = '2022-09-29T20:24:43.339060Z'
         login-session-id = ''
         XDG_RUNTIME_DIR = '/var/run/user/1001'
         VTNr = '9'
Session4:
         unix-user = '1002'
         realname = 'XXX XXXX'
         seat = 'Seat1'
         session-type = 'unspecified'
         session-class = 'user'
         session-state = 'online'
         active = FALSE
         x11-display = ':1'
         x11-display-device = '/dev/ttyv9'
         display-device = '/dev/   ?   '
         remote-host-name = ''
         is-local = TRUE
         on-since = '2022-09-29T20:27:19.450823Z'
         login-session-id = ''
         XDG_RUNTIME_DIR = '/var/run/user/1002'
         VTNr = '10'
-- 
Andriy Gapon