GELI vs bectl: / and /boot not on same device, quitting

# date ; uname -v
Fri 26 Oct 2018 05:17:39 BST
FreeBSD 13.0-CURRENT r339737 GENERIC-NODEBUG
# bectl create -r 13.0-CURRENT
/ and /boot not on same device, quitting
# zpool list
NAME               SIZE  ALLOC   FREE  CKPOINT  EXPANDSZ   FRAG    CAP  DEDUP  HEALTH  ALTROOT
bootpool          1.98G   471M  1.52G        -         -    27%    23%  1.00x  ONLINE  -
hpelitebook8570p   452G   367G  84.7G        -         -    61%    81%  1.00x  ONLINE  -
# mount | grep zfs
hpelitebook8570p/ROOT/default on / (zfs, local, noatime, nfsv4acls)
bootpool on /bootpool (zfs, local, nfsv4acls)
hpelitebook8570p on /hpelitebook8570p (zfs, local, noatime, nfsv4acls)
hpelitebook8570p/bhyve on /hpelitebook8570p/bhyve (zfs, local, noatime, nfsv4acls)
hpelitebook8570p/poudriere on /hpelitebook8570p/poudriere (zfs, local, noatime, nfsv4acls)
hpelitebook8570p/poudriere/jails on /hpelitebook8570p/poudriere/jails (zfs, local, noatime, nfsv4acls)
hpelitebook8570p/poudriere/ports on /hpelitebook8570p/poudriere/ports (zfs, local, noatime, nfsv4acls)
hpelitebook8570p/tmp on /tmp (zfs, local, noatime, nosuid, nfsv4acls)
hpelitebook8570p/usr/home on /usr/home (zfs, local, noatime, nfsv4acls)
hpelitebook8570p/usr/home/grahamperrin on /usr/home/grahamperrin (zfs, local, noatime, nfsv4acls)
hpelitebook8570p/poudriere/data on /usr/local/poudriere/data (zfs, local, noatime, nfsv4acls)
hpelitebook8570p/poudriere/data/.m on /usr/local/poudriere/data/.m (zfs, local, noatime, nfsv4acls)
hpelitebook8570p/poudriere/data/cache on /usr/local/poudriere/data/cache (zfs, local, noatime, nfsv4acls)
hpelitebook8570p/poudriere/data/logs on /usr/local/poudriere/data/logs (zfs, local, noatime, nfsv4acls)
hpelitebook8570p/poudriere/data/packages on /usr/local/poudriere/data/packages (zfs, local, noatime, nfsv4acls)
hpelitebook8570p/poudriere/data/wrkdirs on /usr/local/poudriere/data/wrkdirs (zfs, local, noatime, nfsv4acls)
hpelitebook8570p/poudriere/jails/current on /usr/local/poudriere/jails/current (zfs, local, noatime, nfsv4acls)
hpelitebook8570p/poudriere/jails/stable on /usr/local/poudriere/jails/stable (zfs, local, noatime, nfsv4acls)
hpelitebook8570p/poudriere/ports/default on /usr/local/poudriere/ports/default (zfs, local, noatime, nfsv4acls)
hpelitebook8570p/usr/ports on /usr/ports (zfs, local, noatime, nosuid, nfsv4acls)
hpelitebook8570p/usr/src on /usr/src (zfs, local, noatime, nfsv4acls)
hpelitebook8570p/var/VirtualBox on /var/VirtualBox (zfs, local, noatime, nfsv4acls)
hpelitebook8570p/var/audit on /var/audit (zfs, local, noatime, noexec, nosuid, nfsv4acls)
hpelitebook8570p/var/crash on /var/crash (zfs, local, noatime, noexec, nosuid, nfsv4acls)
hpelitebook8570p/var/log on /var/log (zfs, local, noatime, noexec, nosuid, nfsv4acls)
hpelitebook8570p/var/mail on /var/mail (zfs, local, nfsv4acls)
hpelitebook8570p/var/tmp on /var/tmp (zfs, local, noatime, nosuid, nfsv4acls)
# gpart show
=>       40  976773088  ada0  GPT  (466G)
         40     409600     1  efi  (200M)
     409640       2008        - free -  (1.0M)
     411648    4194304     2  freebsd-zfs  (2.0G)
    4605952   16777216     3  freebsd-swap  (8.0G)
   21383168  955389952     4  freebsd-zfs  (456G)
  976773120          8        - free -  (4.0K)

# zpool status
  pool: bootpool
 state: ONLINE
status: Some supported features are not enabled on the pool. The pool can
        still be used, but some features are unavailable.
action: Enable all features using 'zpool upgrade'. Once this is done,
        the pool may no longer be accessible by software that does not support
        the features. See zpool-features(7) for details.
  scan: scrub repaired 0 in 0 days 00:00:34 with 0 errors on Sun Sep 30 19:47:03 2018
config:

        NAME        STATE     READ WRITE CKSUM
        bootpool    ONLINE       0     0     0
          ada0p2    ONLINE       0     0     0

errors: No known data errors

  pool: hpelitebook8570p
 state: ONLINE
status: Some supported features are not enabled on the pool. The pool can
        still be used, but some features are unavailable.
action: Enable all features using 'zpool upgrade'. Once this is done,
        the pool may no longer be accessible by software that does not support
        the features. See zpool-features(7) for details.
  scan: scrub repaired 0 in 0 days 01:23:36 with 0 errors on Sun Sep 30 21:09:57 2018
config:

        NAME          STATE     READ WRITE CKSUM
        hpelitebook8570p  ONLINE       0     0     0
          ada0p4.eli  ONLINE       0     0     0

errors: No known data errors
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