bazzite-rollback-helper or other commands if needed. rpm-ostree version on boot (GRUB), and as expected, I am able to use my computer. rpm-ostree status. I have no idea what the red line means. SecAdvisories: 1 unknown severity, 7 moderate, 5 important mean? 
rpm-ostree status -v. You'll an index next to each version, in parenthesis. See which number your current version is. I expect it will be two based on the order they show up here. (The count starts at zero.) Run that command to double check me on that, and then run sudo ostree admin pin 2. Run rpm-ostree status -v and under your current version it should say "Pinned: yes". That means it will continue to show up in your bootloader until you unpin it.