Read-only file-system after install?

[Robert]

Hi.

I've installed FreeBSD in ZFS mirror mode many times on different hardware.

The last step was always "Exit to the system to make final changes" 
where I'm performing something like below:

pw useradd -n myuser -s /bin/tcsh -m
pw groupmod wheel -m myuser
passwd myuser

After reboot my user was there and everything worked as expected.

/tmp folder was always writable after reboot btw.


Starting from FreeBSD 11.0 I've noticed a following "bug":

once user added on the final step, all folders are created properly 
(folder /home/myuser is there).

After reboot, I can login as myuser, but /home/myuser is not there! 
/home folder is empty!

Moreover, /tmp is read-only!

So I have to perform:

su
chmod 1777 /tmp
pw userdel -n myuser
pw useradd -n myuser -s /bin/tcsh -m
pw groupmod wheel -m myuser
passwd myuser

after first reboot to recover my user. After further reboots everything 
stays as it should.

Is this expected behavior or a known bug?

If expected - how can I get what I want after installation?

Thanks!