How to make System Monitor list all processes

I noticed some processes are not listed by the new System Monitor, even when the “All Process” option is selected.

See the image below. I am running Discover’s update and System Monitor does not list packagekitd, while htop does.

Is this a known bug, or could I have a missing dependency?

This is my system info:

$ kinfo
Operating System: openSUSE Leap 15.5
KDE Plasma Version: 6.0.4
KDE Frameworks Version: 6.1.0
Qt Version: 6.7.0
Kernel Version: 5.14.21-150500.55.52-default (64-bit)
Graphics Platform: X11