I've submitted a more permanent fix to the upstream project.
https://lists.gnu.org/archive/html/grub-devel/2020-12/msg00239.html
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https://bugs.launchpad.net/bugs/1632694
Title:
This should be fixed in recent Ubuntu's with the change to using
10_linux_zfs because it detects the zpool differently than how upstream
GRUB does it. Upstream GRUB however is still busted.
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Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: grub2 (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1632694
Title:
Persists with grub 2.02~beta2-36ubuntu3.8 on Ubuntu 16.04.2 LTS
4.4.0-66-generic:
# grub-probe --device / --target=fs_label
grub-probe: error: unknown filesystem.
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