I use Arch btw
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This got me looking to see if there is any way to have a fallback as I have had something similar happen to me.
The general advice is to have a liveboot USB around. I even saw that you can have GRUB simply boot from an .iso file on the internal drives, which eliminates the need to keep a USB stick around.
I haven't followed the steps yet but I'll give this a shot because it intrigues me.
https://www.linuxbabe.com/desktop-linux/boot-from-iso-files-using-grub2-boot-loader
Or you could just install NixOS for update rollbacks (or use zfs/btrfs and set an alias to take snapshots whenever you update)
I always have a separate huge kernel on hand that boots without an initrd.
I was installing Nobara 40 and discovered that the live session is allowed to suspend the PC during the install process. The system ended up having problems with some basic functions...