Lomiri does not lock the screen when the power button is pressed

Device: Fairphone 5 running mobian-sc7280-plasma-mobile-20250824.boot-fp5.img with lomiri installed

With an active session, pressing the power button does not lock the screen. There is no response and the session remains active. I expect the screen to be locked like in other desktop environment (e.g. PlasMo).

I can long-press the power button to toggle the power off menu so the hardware is working correctly at least.