1.8.2-1 from cosmic also has this regression

<debug> [1556659895.024512] Starting detailed registration state check
<debug> [1556659895.024533]   Skipping detailed registration state check
<debug> [1556659895.024543] All CDMA registration state checks done
<debug> [1556659895.024636] Will start keeping track of state for subsystem 'cdma1x'
<info>  [1556659895.024671] Modem /org/freedesktop/ModemManager1/Modem/0: state changed (enabled -> registered)
<debug> [1556659895.024907] Periodic signal checks enabled
<debug> [1556659895.024921] Periodic signal check refresh requested
<debug> [1556659895.024931] loading signal quality...
<debug> [1556659895.024956] (rfcomm0) device open count is 4 (open)
<debug> [1556659895.025046] Will start keeping track of state for subsystem 'evdo'
<debug> [1556659895.025076] Modem is currently registered in a CDMA network (CDMA1x: 'yes', EV-DO: 'no')
<info>  [1556659895.025092] Simple connect state (6/8): Bearer
<debug> [1556659895.025104] Creating new bearer...
<debug> [1556659895.025120] Creating Broadband bearer in broadband modem
<debug> [1556659895.025620] (rfcomm0) device open count is 5 (open)
<debug> [1556659895.025679] (rfcomm0) device open count is 4 (close)
<info>  [1556659895.026094] Simple connect state (7/8): Connect
<debug> [1556659895.026129] Connecting bearer '/org/freedesktop/ModemManager1/Bearer/0'
<info>  [1556659895.026155] Modem /org/freedesktop/ModemManager1/Modem/0: state changed (registered -> connecting)
<debug> [1556659895.026456] Launching 3GPP2 connection attempt
<debug> [1556659895.026485] (rfcomm0) device open count is 5 (open)
<debug> [1556659895.026495] Connection through a plain serial AT port (rfcomm0)
<debug> [1556659895.026515] (rfcomm0) device open count is 6 (open)
<debug> [1556659895.026554] (rfcomm0) device open count is 5 (close)
<debug> [1556659895.026584] (rfcomm0): --> 'AT+CSS?<CR>'
<debug> [1556659895.049351] (rfcomm0): <-- '<CR><LF>?, 26<CR><LF><CR><LF>OK<CR><LF>'
<debug> [1556659895.049510] Starting detailed registration state check
<debug> [1556659895.049527]   Skipping detailed registration state check
<debug> [1556659895.049537] All CDMA registration state checks done
<debug> [1556659895.049702] Initial CDMA registration checks finished
<debug> [1556659895.049727] (rfcomm0) device open count is 4 (close)
<debug> [1556659895.049766] (rfcomm0): --> 'AT+CSQ<CR>'
<debug> [1556659895.070553] (rfcomm0): <-- '<CR><LF>22, 99<CR><LF><CR><LF>OK<CR><LF>'
<debug> [1556659895.070772] Modem /org/freedesktop/ModemManager1/Modem/0: signal quality updated (70)
<debug> [1556659895.070809] EVDO registration: 0
<debug> [1556659895.070818] CDMA1x registration: 1
<debug> [1556659895.070825] Fallback access tech: 0x00000400
<debug> [1556659895.070836] Fallback access technology: 0x00000400
<debug> [1556659895.070867] (rfcomm0) device open count is 3 (close)
<debug> [1556659895.071116] Modem /org/freedesktop/ModemManager1/Modem/0: access technology changed (unknown -> 1xrtt)
<debug> [1556659895.071149] Periodic signal quality checks scheduled in 30s
<debug> [1556659895.071290] (rfcomm0): --> 'ATDT#777<CR>'
<debug> [1556659896.924337] (rfcomm0): <-- '<CR><LF>CONNECT 2400000<CR><LF>'
<debug> [1556659896.924406] [rfcomm0] Setting flow control: rts-cts
<debug> [1556659896.924414] (rfcomm0): enabling RTS/CTS flow control
<debug> [1556659896.924431] (rfcomm0): port now connected
<debug> [1556659896.924450] Connected bearer '/org/freedesktop/ModemManager1/Bearer/0'
<info>  [1556659896.924532] Modem /org/freedesktop/ModemManager1/Modem/0: state changed (connecting -> connected)
<info>  [1556659896.924655] Simple connect state (8/8): All done
<debug> [1556659896.924705] (rfcomm0) device open count is 2 (close)
<debug> [1556659896.952641] (net/ppp0): adding device at sysfs path: /sys/devices/virtual/net/ppp0
<debug> [1556659896.952743] [filter] (net/ppp0) port filtered: virtual device
<debug> [1556659925.033012] Running registration checks (CDMA1x: 'yes', EV-DO: 'yes')
<debug> [1556659925.033073] Will skip all QCDM-based registration checks
<debug> [1556659925.033086] Will skip generic detailed registration check, we don't have Sprint commands
<debug> [1556659925.033111] loading signal quality...
<debug> [1556659925.033158] Starting QCDM-based registration checks
<debug> [1556659925.033169]   Skipping all QCDM-based checks and falling back to AT-based checks
<debug> [1556659925.033210] Starting AT-based registration checks
<debug> [1556659925.033260] Couldn't refresh signal quality: 'No AT port available to run command'
<debug> [1556659925.033324] EVDO registration: 0
<debug> [1556659925.033346] CDMA1x registration: 1
<debug> [1556659925.033375] Fallback access tech: 0x00000400
<debug> [1556659925.033389] Fallback access technology: 0x00000400
<debug> [1556659925.033448] No CDMA service found
<debug> [1556659925.033470] All CDMA registration state checks done
<debug> [1556659925.033565] Connected bearer not registered in CDMA network
<debug> [1556659925.033686] Periodic signal quality checks scheduled in 30