11.3RC2 - Fails to boot - middleware.plugins.crypto

I'm referencing this thread in the forums: https://www.ixsystems.com/community/threads/freenas-will-not-boot-stuck-on-middlewared-loaded-plugin-middleware-d-plugins-crypto.81692/#post-565641 

I recently upgraded to 11.3RC2 - I could have sworn I had rebooted a few times with the upgrade from 11.2U7 to 11.3RC2 but today upon rebooting the system I reached a point where the system would boot then apparently get stuck displaying:

middleward: loaded plugin middlewared.plugins.crypto -- and then go no further

Per advice in the forums, I rebooted with 11.3RC2 boot environment and hit Cntl-C to proceed

I'm posting here my /var/log/middleware.log when booting into the unstable system:

# cat /var/log/middlewared.log
[2020/01/24 23:02:25] (DEBUG) raven.base.Client.set_dsn():272 - Configuring Raven for host: https://sentry.ixsystems.com
[2020/01/24 23:02:26] (ERROR) asyncio.default_exception_handler():1615 - Task exception was never retrieved
future: <Task finished coro=<Middleware.__initialize() done, defined at /usr/local/lib/python3.7/site-packages/middlewared/main.py:1298> exception=ModuleNotFoundError("No module named 'freenasUI.settings'")>
Traceback (most recent call last):
  File "/usr/local/lib/python3.7/site-packages/middlewared/main.py", line 1305, in __initialize
    setup_funcs = await self.__plugins_load()
  File "/usr/local/lib/python3.7/site-packages/middlewared/main.py", line 797, in __plugins_load
    on_modules_loaded=on_modules_loaded,
  File "/usr/local/lib/python3.7/site-packages/middlewared/utils/__init__.py", line 504, in _load_plugins
    for mod in load_modules(plugins_dir):
  File "/usr/local/lib/python3.7/site-packages/middlewared/utils/__init__.py", line 463, in load_modules
    yield imp.load_module(name, fp, pathname, description)
  File "/usr/local/lib/python3.7/imp.py", line 234, in load_module
    return load_source(name, filename, file)
  File "/usr/local/lib/python3.7/imp.py", line 171, in load_source
    module = _load(spec)
  File "<frozen importlib._bootstrap>", line 696, in _load
  File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 728, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/local/lib/python3.7/site-packages/middlewared/plugins/datastore.py", line 15, in <module>
    django.setup()
  File "/usr/local/lib/python3.7/site-packages/django/__init__.py", line 22, in setup
    configure_logging(settings.LOGGING_CONFIG, settings.LOGGING)
  File "/usr/local/lib/python3.7/site-packages/django/conf/__init__.py", line 56, in __getattr__
    self._setup(name)
  File "/usr/local/lib/python3.7/site-packages/django/conf/__init__.py", line 41, in _setup
    self._wrapped = Settings(settings_module)
  File "/usr/local/lib/python3.7/site-packages/django/conf/__init__.py", line 110, in __init__
    mod = importlib.import_module(self.SETTINGS_MODULE)
  File "/usr/local/lib/python3.7/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 965, in _find_and_load_unlocked
ModuleNotFoundError: No module named 'freenasUI.settings'

I was able to roll back to 11.2U7 and everything seemed OK except for none of my jails iocage jails showing in the GUI (please note that warden jails still functioned properly).  

iocage list gave following feedback:

# iocage list
Traceback (most recent call last):
  File "/usr/local/bin/iocage", line 10, in <module>
    sys.exit(cli())
  File "/usr/local/lib/python3.6/site-packages/click/core.py", line 722, in __call__
    return self.main(*args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/click/core.py", line 697, in main
    rv = self.invoke(ctx)
  File "/usr/local/lib/python3.6/site-packages/click/core.py", line 1066, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/local/lib/python3.6/site-packages/click/core.py", line 895, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/local/lib/python3.6/site-packages/click/core.py", line 535, in invoke
    return callback(*args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/iocage_cli/list.py", line 81, in cli
    dataset_type, header, _long, _sort, plugin=plugins, quick=quick)
  File "/usr/local/lib/python3.6/site-packages/iocage_lib/iocage.py", line 1169, in list
    quick=quick
  File "/usr/local/lib/python3.6/site-packages/iocage_lib/ioc_list.py", line 64, in list_datasets
    iocage_lib.ioc_json.IOCJson().json_check_default_config()
  File "/usr/local/lib/python3.6/site-packages/iocage_lib/ioc_json.py", line 1924, in json_check_default_config
    self.json_write(default_props, default_json_location)
  File "/usr/local/lib/python3.6/site-packages/iocage_lib/ioc_json.py", line 431, in json_write
    if template else None
  File "libzfs.pyx", line 645, in libzfs.ZFS.get_dataset_by_path
libzfs.ZFSException: Dataset with path  not found

My /mnt/tank/iocage/defaults.json file on 11.2U7

{
    "CONFIG_VERSION": "26",
    "allow_chflags": 0,
    "allow_mlock": 0,
    "allow_mount": 0,
    "allow_mount_devfs": 0,
    "allow_mount_fusefs": 0,
    "allow_mount_nullfs": 0,
    "allow_mount_procfs": 0,
    "allow_mount_tmpfs": 0,
    "allow_mount_zfs": 0,
    "allow_quotas": 0,
    "allow_raw_sockets": 0,
    "allow_set_hostname": 1,
    "allow_socket_af": 0,
    "allow_sysvipc": 0,
    "allow_tun": 0,
    "allow_vmm": 0,
    "assign_localhost": 0,
    "available": "readonly",
    "basejail": 0,
    "boot": 0,
    "bpf": 0,
    "children_max": "0",
    "comment": "none",
    "compression": "lz4",
    "compressratio": "readonly",
    "coredumpsize": "off",
    "count": "1",
    "cpuset": "off",
    "cputime": "off",
    "datasize": "off",
    "dedup": "off",
    "defaultrouter": "auto",
    "defaultrouter6": "auto",
    "depends": "none",
    "devfs_ruleset": "4",
    "dhcp": 0,
    "enforce_statfs": "2",
    "exec_clean": 1,
    "exec_created": "/usr/bin/true",
    "exec_fib": "0",
    "exec_jail_user": "root",
    "exec_poststart": "/usr/bin/true",
    "exec_poststop": "/usr/bin/true",
    "exec_prestart": "/usr/bin/true",
    "exec_prestop": "/usr/bin/true",
    "exec_start": "/bin/sh /etc/rc",
    "exec_stop": "/bin/sh /etc/rc.shutdown",
    "exec_system_jail_user": "0",
    "exec_system_user": "root",
    "exec_timeout": "60",
    "host_domainname": "none",
    "host_time": 1,
    "hostid": "00000000-0000-0000-0000-0cc47a84a594",
    "hostid_strict_check": 0,
    "interfaces": "vnet0:bridge0",
    "ip4": "new",
    "ip4_addr": "none",
    "ip4_saddrsel": 1,
    "ip6": "new",
    "ip6_addr": "none",
    "ip6_saddrsel": 1,
    "ip_hostname": 0,
    "jail_zfs": 0,
    "jail_zfs_mountpoint": "none",
    "last_started": "none",
    "localhost_ip": "none",
    "login_flags": "-f root",
    "mac_prefix": "02ff60",
    "maxproc": "off",
    "memorylocked": "off",
    "memoryuse": "off",
    "mount_devfs": 1,
    "mount_fdescfs": 1,
    "mount_linprocfs": 0,
    "mount_procfs": 0,
    "mountpoint": "readonly",
    "msgqqueued": "off",
    "msgqsize": "off",
    "nat": 0,
    "nat_backend": "ipfw",
    "nat_forwards": "none",
    "nat_interface": "none",
    "nat_prefix": "172.16",
    "nmsgq": "off",
    "notes": "none",
    "nsem": "off",
    "nsemop": "off",
    "nshm": "off",
    "nthr": "off",
    "openfiles": "off",
    "origin": "readonly",
    "owner": "root",
    "pcpu": "off",
    "plugin_name": "none",
    "plugin_repository": "none",
    "priority": "99",
    "pseudoterminals": "off",
    "quota": "none",
    "readbps": "off",
    "readiops": "off",
    "reservation": "none",
    "resolver": "/etc/resolv.conf",
    "rlimits": "off",
    "rtsold": 0,
    "securelevel": "2",
    "shmsize": "off",
    "stacksize": "off",
    "stop_timeout": "30",
    "swapuse": "off",
    "sync_state": "none",
    "sync_target": "none",
    "sync_tgt_zpool": "none",
    "sysvmsg": "new",
    "sysvsem": "new",
    "sysvshm": "new",
    "template": 0,
    "type": "jail",
    "used": "readonly",
    "vmemoryuse": "off",
    "vnet": 0,
    "vnet0_mac": "none",
    "vnet1_mac": "none",
    "vnet2_mac": "none",
    "vnet3_mac": "none",
    "vnet_default_interface": "auto",
    "vnet_interfaces": "none",
    "wallclock": "off",
    "writebps": "off",
    "writeiops": "off"
}

I've attached debug log from 11.2U7