Hi. If I understand it correctly “official” repo for pacman doesn’t contain NoMachine, only AUR.
I use xfce and I’m sure I used 1st option to install nomachine – nomachine 8.11.3-1. I was suggested to try a fix from Arch forums [removed] section 5.1 “alternative fix”, but I didn’t try it yet. Before I got that it is NoMachine breaks my boot process, I had installed Manjaro with NoMachine for 2 or 3 times. So for me it’s the reproducible problem) If I decide to install NoMachine again, I will test on virtual machine firstly.