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All other lvms in the container have mounted correctly. Seems the system is confusing / with the PV container itself and trying to mount the PV as / as ext4 which it can't. There are no systemd logs at this stage of the boot process.
Turns out the ext4 fs was a little corrupted as I had yanked it without properly umounting first. The partition wouldn't umount as it had /proc /sys /dev /dev/pts bind mounted in there. Had to reinstall and this time umounted the kernel fs from inside the chroot environment.