I am running Fedora 43 KDE and have configured automatic updates to apply after reboot. That’s worked great for a long time, but recently Discover has started opening itself in the foreground in front of whatever I’m actively doing, opening itself to the Updates page and checking for updates. I don’t know why it started doing this or how to make it stop. I haven’t changed any update settings in a long time.
have you tried setting updates to manual?
have you tried unchecking the offline updates box?