Eric Biggers has fixed this bug in the upstream GNU GRUB project: https://git.savannah.gnu.org/cgit/grub.git/commit/?id=734668238fcc0ef691a080839e04f33854fa133a
I prepared an upload to fix this issue in Ubuntu Artful and it required minor backporting of the test suite changes. Maybe you'll find the debdiff containing the backported patch useful: https://launchpadlibrarian.net/326938267/grub2_2.02~beta3-4ubuntu5_2.02~beta3-4ubuntu6.diff.gz Tyler
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