Pike Bundle deployment fails with LXD error: root device is missing the pool propery

[schkovich]

$ juju --version
2.3.1-xenial-amd64
$ lxd --version
2.21
$ snap info lxd
services:
  lxd.daemon:    simple, enabled, active
tracking:        edge
installed:       git-340f6f7 (5552) 47MB -

Deployed bundle-pike.yaml is failing with error "The container's root device is missing the pool property."

See LXD gives error "The container's root device is missing the pool property."