[Bug 257080] [hyper-v] FreeBSD 13.0 can't boot on hyper-v 2012 with root on zfs

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=257080

            Bug ID: 257080
           Summary: [hyper-v] FreeBSD 13.0 can't boot on hyper-v 2012 with
                    root on zfs
           Product: Base System
           Version: 13.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: 4diman@gmail.com

It show menu, then tying to load kernel, but fails.
ZFS: i/o error - all block copies unavailable

Installed via default installer.
Same setup on hyper-v 2012r2 works fine.
Same setup on FreeBSD 12,11,10 on hyper-v 2012 works fine.
Setup with root on UFS works fine.

A few more info, including one workaround:
https://forums.freebsd.org/threads/freebsd-13-0-with-root-on-zfs-on-hyper-v-2012.81168/

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