How to turn off display & lock the screen after inactivity on KDE Neon based on Ubuntu?

Help
1 
Operating System: KDE neon User Edition
KDE Plasma Version: 6.6.2
KDE Frameworks Version: 6.24.0
Qt Version: 6.10.2
Kernel Version: 6.17.0-19-generic (64-bit)
Graphics Platform: Wayland

Hello, I have noticed that the screen remains turned on and do not blank(turn off) after inactivity of several minutes.

I think that it previously worked.

screen locking
screen locking926×260 13.8 KB

Power management
Power management922×514 21.4 KB

Do you have idea what to try please?
I would like to turn off the display after 1 or 2 minutes of inactivity and also lock the screen so password is required to unlock the session.

Manual session locking works via GUI button or via command “loginctl lock-session --output=verbose”

2

Tried this on my laptop which has Neon and is up to date and this works for X11 and Wayland session.

The Wayland session took a bit longer after locking before it also turned off the screen but I didn’t repeat to time it.