I've found another bug in grub's lvm probing that caused this same problem with the UUID to have surfaced in my case. See #743126
I hesitate to say that fixing that bug closes this one. There seem to be multiple failure modes that get a UUID into the kernel command line for LVM root filesystems, and so it would probably be good to defend against that in depth by noticing when this has happened and either a) fix it or b) make the initramfs robust enough to manage to boot successfully. -- see shy jo
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