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NetworkManager invalid bearer IP configuration

Hello all,
I have run into a problem with NetworkManager and ModemManager, where NetworkManager fails to complete the connection due to an "invalid bearer IP configuration". In this state, ModemManager shows the modem as connected with 2 bearers, and one of them has an unknown IPv4 configuration. I have many devices running the same configuration, and I have seen this multiple times. I don't know what is causing this, but it appears to happen most frequently when the RTC of the device is set improperly, or doesn't keep time without power. I can fairly regularly reproduce the issue by setting the hardware clock to a time in the past and rebooting or power-cycling the host. I have devices with the same software configuration using a different modem (an MC7750) and I have never seen, or been able to cause this issue with that modem. Logs and some digging from the command-line are shown below.
------------------------------------------------------------------------------ NetworkManager Logs ------------------------------------------------------------------------------
Sep 16 21:33:37 localhost NetworkManager[224]: <info> Auto-activating connection 'Verizon'. Sep 16 21:33:37 localhost NetworkManager[224]: <info> (cdc-wdm1): Activation: starting connection 'Verizon' (8868b767-a938-4096-9b90-9a1bebb398f9) Sep 16 21:33:37 localhost NetworkManager[224]: <info> (cdc-wdm1): device state change: disconnected -> prepare (reason 'none') [30 40 0] Sep 16 21:33:38 localhost NetworkManager[224]: <warn> (cdc-wdm1): disconnecting connection 'Verizon' for new activation request. Sep 16 21:33:38 localhost NetworkManager[224]: <info> (cdc-wdm1): device state change: prepare -> deactivating (reason 'new-activation') [40 110 60] Sep 16 21:33:38 localhost NetworkManager[224]: <info> (cdc-wdm1): disconnecting for new activation request. Sep 16 21:33:38 localhost NetworkManager[224]: <info> (cdc-wdm1): device state change: deactivating -> disconnected (reason 'new-activation') [110 30 60] Sep 16 21:33:38 localhost NetworkManager[224]: <info> (cdc-wdm1): Activation: starting connection 'Verizon' (8868b767-a938-4096-9b90-9a1bebb398f9) Sep 16 21:33:38 localhost NetworkManager[224]: <info> (cdc-wdm1): device state change: disconnected -> prepare (reason 'none') [30 40 0] Sep 16 21:33:38 localhost NetworkManager[224]: <info> (cdc-wdm1): modem state changed, 'enabling' --> 'registered' (reason: user-requested) Sep 16 21:33:38 localhost NetworkManager[224]: <info> (cdc-wdm1): modem state changed, 'registered' --> 'connecting' (reason: user-requested) Sep 16 21:33:38 localhost NetworkManager[224]: <info> (cdc-wdm1): modem state changed, 'connecting' --> 'registered' (reason: user-requested) Sep 16 21:33:38 localhost NetworkManager[224]: <info> (cdc-wdm1): modem state changed, 'registered' --> 'connecting' (reason: user-requested) Sep 16 21:33:39 localhost NetworkManager[224]: <info> (cdc-wdm1): modem state changed, 'connecting' --> 'connected' (reason: user-requested) Sep 16 21:33:39 localhost NetworkManager[224]: <warn> (cdc-wdm1): failed to connect modem: invalid bearer IP configuration Sep 16 21:33:39 localhost NetworkManager[224]: <info> (cdc-wdm1): device state change: prepare -> failed (reason 'config-failed') [40 120 4] Sep 16 21:33:39 localhost NetworkManager[224]: <warn> (cdc-wdm1): Activation: failed for connection 'Verizon' Sep 16 21:33:39 localhost NetworkManager[224]: <info> (cdc-wdm1): modem state changed, 'connected' --> 'disconnecting' (reason: user-requested) Sep 16 21:33:39 localhost NetworkManager[224]: <info> (cdc-wdm1): device state change: failed -> disconnected (reason 'none') [120 30 0] Sep 16 21:33:39 localhost NetworkManager[224]: <info> (cdc-wdm1): modem state changed, 'disconnecting' --> 'connected' (reason: user-requested) Sep 16 21:33:39 localhost NetworkManager[224]: (NetworkManager:224): NetworkManager-wwan-CRITICAL **: modem_prepare_result: assertion 'state == NM_DEVICE_STATE_PREPARE' failed Sep 16 21:33:39 localhost NetworkManager[224]: <info> Auto-activating connection 'Verizon'. Sep 16 21:33:39 localhost NetworkManager[224]: <info> (cdc-wdm1): Activation: starting connection 'Verizon' (8868b767-a938-4096-9b90-9a1bebb398f9) Sep 16 21:33:39 localhost NetworkManager[224]: <info> (cdc-wdm1): device state change: disconnected -> prepare (reason 'none') [30 40 0] Sep 16 21:33:39 localhost NetworkManager[224]: <warn> (cdc-wdm1): failed to connect modem: invalid bearer IP configuration Sep 16 21:33:39 localhost NetworkManager[224]: <info> (cdc-wdm1): device state change: prepare -> failed (reason 'config-failed') [40 120 4] Sep 16 21:33:39 localhost NetworkManager[224]: <warn> (cdc-wdm1): Activation: failed for connection 'Verizon' Sep 16 21:33:39 localhost NetworkManager[224]: <info> (cdc-wdm1): device state change: failed -> disconnected (reason 'none') [120 30 0] Sep 16 21:33:39 localhost NetworkManager[224]: <info> Auto-activating connection 'Verizon'. Sep 16 21:33:39 localhost NetworkManager[224]: <info> (cdc-wdm1): Activation: starting connection 'Verizon' (8868b767-a938-4096-9b90-9a1bebb398f9) Sep 16 21:33:39 localhost NetworkManager[224]: <info> (cdc-wdm1): device state change: disconnected -> prepare (reason 'none') [30 40 0] Sep 16 21:33:39 localhost NetworkManager[224]: <warn> (cdc-wdm1): failed to connect modem: invalid bearer IP configuration Sep 16 21:33:39 localhost NetworkManager[224]: <info> (cdc-wdm1): device state change: prepare -> failed (reason 'config-failed') [40 120 4] Sep 16 21:33:39 localhost NetworkManager[224]: <warn> (cdc-wdm1): Activation: failed for connection 'Verizon' Sep 16 21:33:39 localhost NetworkManager[224]: <info> (cdc-wdm1): device state change: failed -> disconnected (reason 'none') [120 30 0]
------------------------------------------------------------------------------ Command Line Introspection ------------------------------------------------------------------------------ 

console@localhost:~$ nmcli d
DEVICE    TYPE      STATE         CONNECTION
eth0      ethernet  connected     eth0-DHCP
cdc-wdm1  gsm       disconnected  --
lo        loopback  unmanaged     --
console@localhost:~$ mmcli -m 0
/org/freedesktop/ModemManager1/Modem/0 (device id 'dba163d88766f89690dde112e66dd89239d2af9d') 
  -------------------------
  Hardware |   manufacturer: 'Sierra Wireless, Incorporated'
           |          model: 'MC7354'
| revision: 'SWI9X15C_05.05.58.01 r27044 carmd-fwbuild1 2015/03/05 00:02:40' 
           |      supported: 'gsm-umts
           |                  cdma-evdo
           |                  lte
           |                  cdma-evdo, gsm-umts
           |                  gsm-umts, lte
           |                  cdma-evdo, lte
           |                  cdma-evdo, gsm-umts, lte'
           |        current: 'cdma-evdo, gsm-umts, lte'
           |   equipment id: 'XXXXXXXXXXXXXXX'
  -------------------------
System | device: '/sys/devices/platform/ocp/47400000.usb/47401c00.usb/musb-hdrc.1.auto/usb1/1-1' 
           |        drivers: 'qmi_wwan, option1'
           |         plugin: 'Generic'
           |   primary port: 'cdc-wdm1'
| ports: 'ttyUSB0 (qcdm), uplink0 (net), ttyUSB2 (at), cdc-wdm1 (qmi), wwan1 (net), cdc-wdm0 (qmi)' 
  -------------------------
  Numbers  |           own : 'XXXXXXXXXX'
  -------------------------
  Status   |           lock: 'sim-pin2'
| unlock retries: 'sim-pin (3), sim-pin2 (3), sim-puk (10), sim-puk2 (10)' 
           |          state: 'connected'
           |    power state: 'on'
           |    access tech: 'lte'
           | signal quality: '55' (recent)
  -------------------------
  Modes    |      supported: 'allowed: 2g, 3g, 4g; preferred: none'
           |        current: 'allowed: 2g, 3g, 4g; preferred: none'
  -------------------------
Bands | supported: 'cdma-bc0-cellular-800, cdma-bc1-pcs-1900, cdma-bc10-secondary-800, cdma-bc15-aws, dcs, egsm, pcs, g850, u2100, u1900, u17iv, u850, u900, eutran-ii, eutran-iv, eutran-v, eutran-xiii, eutran-xvii, eutran-xxv' | current: 'cdma-bc0-cellular-800, cdma-bc1-pcs-1900, cdma-bc15-aws, dcs, egsm, pcs, g850, u2100, u1900, u850, u900, eutran-iv, eutran-xiii' 
  -------------------------
  IP       |      supported: 'ipv4, ipv6, ipv4v6'
  -------------------------
  3GPP     |           imei: 'XXXXXXXXXXXXXXX'
           |  enabled locks: 'none'
           |    operator id: '311480'
           |  operator name: 'VZW'
           |   subscription: 'unknown'
           |   registration: 'home'
  -------------------------
  CDMA     |           meid: 'XXXXXXXXXXXXXXX'
           |            esn: 'XXXXXXXX'
           |            sid: 'unknown'
           |            nid: 'unknown'
           |   registration: CDMA1x 'unknown'
           |                 EV-DO  'unknown'
           |     activation: 'activated'
  -------------------------
  SIM      |           path: '/org/freedesktop/ModemManager1/SIM/0'

  -------------------------
Bearers | paths: '/org/freedesktop/ModemManager1/Bearer/2, /org/freedesktop/ModemManager1/Bearer/0' 

console@localhost:~$ mmcli -b 2
Bearer '/org/freedesktop/ModemManager1/Bearer/2'
  -------------------------
  Status             |   connected: 'yes'
                     |   suspended: 'no'
                     |   interface: 'uplink0'
                     |  IP timeout: '20'
  -------------------------
  Properties         |         apn: 'mw01.vzwstatic'
                     |     roaming: 'allowed'
                     |     IP type: 'ipv4'
                     |        user: 'none'
                     |    password: 'none'
                     |      number: '*99#'
                     | Rm protocol: 'unknown'
  -------------------------
  IPv4 configuration |   method: 'dhcp'
                     |  address: 'unknown'
                     |   prefix: '0'
                     |  gateway: 'unknown'
                     |      DNS: none
                     |      MTU: '1428'
  -------------------------
  IPv6 configuration |   method: 'unknown'
console@localhost:~$ mmcli -b 0
Bearer '/org/freedesktop/ModemManager1/Bearer/0'
  -------------------------
  Status             |   connected: 'yes'
                     |   suspended: 'no'
                     |   interface: 'uplink0'
                     |  IP timeout: '20'
  -------------------------
  Properties         |         apn: 'mw01.vzwstatic'
                     |     roaming: 'allowed'
                     |     IP type: 'ipv4v6'
                     |        user: 'none'
                     |    password: 'none'
                     |      number: '*99#'
                     | Rm protocol: 'unknown'
  -------------------------
  IPv4 configuration |   method: 'unknown'
  -------------------------
  IPv6 configuration |   method: 'unknown'
rer 0le@localhost:~$ sudo mmcli -m 0 --delete-bear
console@localhost:~$ sudo nmcli c up Verizon
Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/6) 
console@localhost:~$ nmcli d
DEVICE    TYPE      STATE      CONNECTION
eth0      ethernet  connected  eth0-DHCP
cdc-wdm1  gsm       connected  Verizon
lo        loopback  unmanaged  --
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