Mode Limitation Not Respected

[John Marrett]

I have a few systems running mmcli 1.10.0 with qmicli 1.22.2 that aren't
respecting limitations on the supported mode.

I've configured the modem (Quectel UC20) using modem manager to only accept
2g:

  --------------------------
  Modes    |      supported: allowed: 2g; preferred: none
           |                 allowed: 3g; preferred: none
           |                 allowed: 2g, 3g; preferred: 3g
           |                 allowed: 2g, 3g; preferred: 2g
           |        current: allowed: 2g; preferred: none

However our device is still connected using UMTS:

           |    access tech: umts

Can anyone offer me any advice on how to fully disable the use of 3G?

Thanks very much,

-JohnF
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