According to upstream https://bugs.kde.org/show_bug.cgi?id=455070 this is a snapd issue. They are considering a special case fix.
** Changed in: plasma-systemmonitor (Ubuntu) Status: New => Confirmed ** Bug watch added: KDE Bug Tracking System #455070 https://bugs.kde.org/show_bug.cgi?id=455070 ** Also affects: snapd (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1993856 Title: Some graphical programs (snaps for sure) do not appear on programs list To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/plasma-systemmonitor/+bug/1993856/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs