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Same at https://bugs.centos.org/view.php?id=12733
The patch at https://bugzilla.redhat.com/attachment.cgi?id=1225746 looks correct to me; I don't see why it would cause any errors like "no symbol table". I suspect that's caused by something unrelated that was hit incidentally in building or deploying test packages.
Reproduced on RHEL-7.3 GA using both methods described in the bug - using rear and changing the fs UUID. Retested using the same steps on RHEL-7.6 with grub2-2.02-0.73.el7 and rear-2.4-1.el7 and this issue is not reproducible any more. Moving to VERIFIED.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2018:3264