This is just a quick post, I mainly write for myself, in case it should happen to me again. I temporarily broke my Fedora Silverblue installation for the second time by running the command:
sudo rpm-ostree ex livefs --i-like-danger after I installed a new package.
One has to append --i-like-danger for a reason, but I didn’t want to hear. I wanted to try the new package directly without rebooting my PC.