I have set up Arch Linux with full-disk encryption and partitioned my system disk using LVM. I just changed the motherboard, CPU and RAM of my machine, and after enabling legacy boot and disabling secure boot it booted fine at least once — I was asked for the LUKS passphrase, the GRUB menu showed up, lightdm and Awesome WM started fine, and I used the system for some hours. I then started Windows 7 and established that it refuses to work with current gen hardware. It may have messed with things in the process. Next time I booted the LUKS prompt showed up, I got the GRUB menu, and selected Arch Linux, but shortly afterwards my screen looked like this:

Starting version 241.7-2-arch
ERROR: device '/dev/mapper/vg-root' not found. Skipping fsck.
mount: /new_root: no filesystem type specified.
You are now being dropped into an emergency shell.
sh: can't access tty: job control turned off
[rootfs ]#

The really weird thing is that /dev/mapper/vg-root clearly does exist: I was able to mount it, mount my home directory within it, chroot to it and see all my files, and finally when I ran reboot outside the chroot it took me straight to the lightdm login screen. Why reboot would continue the boot rather than restart the machine is beyond me, but might just be a red herring.

What is going on here? Is there some known issue with this version of systemd?

I verified that the UUID of the root disk has not changed.

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