Follow-up Comment #5, bug #44448 (project grub): There are no special diagnostic options. You could either use gdb (set break point on grub_zfs_open and follow it) or simply add debugging output. Start with grub_zfs_open in grub-core/fs/zfs/zfs.c, add top level printf to see which branch is followed and drill down until you hit place which fails.
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