Comment 4 for bug 1881197

I have the same issue, in my case at least it's definitely the issue you found Sebastien.

As pointed out at https://answers.launchpad.net/ubuntu/+source/gnome-system-monitor/+question/693912, Ubuntu is not a rolling release, but it would improve UX, and as noted at https://wiki.ubuntu.com/StableReleaseUpdates updates with simple changes that don't affect infrastructure may be candidates.

Of course, it's not my decision to make, and if there's no interest I will instead report to the Linux Mint people, but I figure trying upstream first is better.