Follow-up Comment #1, bug #59614 (project grub):
I believe the issue is with grub-probe not supporting the filesystem features
that Ubuntu is using. You can see it mentioned in the OpenZFS Ubuntu 20.04
Guide
<https://openzfs.github.io/openzfs-docs/Getting%20Started/Ubuntu/Ubuntu%2020.04%20Root%20on%20ZFS.html>
under Step 2 Item 7.
I think there should be a cleaner approach that always uses zfs instead of
grub-probe for best compatibility. Just like 10_linux_zfs does.
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