When you boot the machine, get into the BIOS boot menu, select Bazzite/Fedora in your boot options and immediately press ESC once (this should get you into your Grub menu) from here you should be able to boot a previous version of Bazzite before the update. First option will be Ostree 0 (your current updated system) then you should have Ostree 1 (this will be your system before you updated it). Try boot your version before the update
If that works you might want to rollback with reboot (which will boot you old image now your default image) then disable autoupdates until the next stable release comes out. You can do this in the Terminal with