Pressing power key does not bring system back up and requires multiple power button press
It is unclear that this is Plasma/KWin bug or some kind of kernel bug,
But essentially, when this happens, pressing power button once does not wake system up and you need to press power button at least 3 times to wake device up.
Downstream issue : https://gitlab.manjaro.org/manjaro-arm/issues/pinephone/plasma-mobile/-/issues/58
Edited by Bhushan Shah