About a year ago, I debugged a minor gnome-tweaks problem, which someone else found was actually a bug in gnome-software. (https://forums.puri.sm/t/unable-to-download-updates-from-odrs-gnome-org-message/2938/17?u=wayne).
If I am reading the activity correctly, this may be at least partly fixed in a merge, though the bug is actually still open waiting for another. Nevertheless, this package is modified by Purism and should be updated. buster is at 3.30.6-5.