Does not detect ZFS on FreeBSD_11-Cureent

[Beeblebrox-BSD]

After code upgrade on the main grub tree, grub is able to compile on FreeBSD once again. However, after compile and install, grub-probe still fails:
[code]# grub-probe -d dev/ada0p1
grub-probe: error: unknown filesystem.[/code]
Grub appears to work with ZFS on FreeBSD-10*; the problem is with 11.