The problem seems to be that grub-mkconfig doesn't account for grub-probe producing a multiple lines of output with a ZFS root device:
/usr/sbin/grub-probe --target=device / /dev/sdj1 /dev/sdi3
The problem seems to be that grub-mkconfig doesn't account for grub-probe producing a multiple lines of output with a ZFS root device:
/usr/sbin/ grub-probe --target=device /
/dev/sdj1
/dev/sdi3