Suggest running: guestfish -a image -i rm /etc/machine-id on the template as a work around. For further discussion see bug 1554546.
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-2018:1114