Installed add-ons for system apps are removable on Fedora Silverblue
Installed add-ons that are part of the base ostree image on Fedora Silverblue are clickable in GNOME Software. Clicking on them triggers the "Are you sure you want to remove ...?" dialog, however when accepted, they are not removed and error dialog is shown instead.
Maybe I am wrong, but I don't think they should be removable in GNOME Software.
Fedora Silverblue 29
gnome-software-3.30.6-1.fc29.x86_64