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a60fb26
(Get the code!)
How exactly are you cloning the disks? If it was a byte for byte clone, then the partitions on the cloned disk would have the same UUID as the originals. Check the output of the blkid command. If they have the same UUID, then connecting both at once will confuse the system. If you change the UUID of the clone, then you will need to reinstall grub as it will still be looking for the original UUID.