[Bug 265517] Unattended install FreeBSD 13.1 ZFS+UEFI fails: "cannot unmount '/mnt': pool or dataset busy"

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=265517

--- Comment #1 from Mark Huizer <xaa+fbsdbug@dohd.org> ---
I have tried some debugging.

I've tried to modify the source in bsdinstall/unmount, since a previous patch I
sent was changed in a slightly bad fashion:

the "bsdinstall export" is done before the "bsdinstall unmount", which doesn't
make sense to me.

That didn't work.

Then I tried to see if an explicit "umount /mnt/dev" and "umount /mnt/boot/efi"
would make a difference, but it didn't.

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