LOG-LEVEL not working properly

[José]

I am using the following to launch ModemManager

ModemManager --log-level=ERR

and then connecting using mmcli -m 0 -e and mmcli -m 0 --simple-connect=...

Most of the messages, are removed. But there are some no error message
which still shows up, like these:

ModemManager[671]: opening device...
ModemManager[671]: opening device...
ModemManager[671]: cannot connect to proxy: Could not connect: Connection
refused
ModemManager[671]: cannot connect to proxy: Could not connect: Connection
refused
ModemManager[671]: spawning new mbim-proxy (try 1)...
ModemManager[671]: spawning new mbim-proxy (try 1)...
ModemManager[671]: [/dev/cdc-wdm0] Read max control message size from
descriptors file: 4096
ModemManager[671]: [/dev/cdc-wdm0] Read max control message size from
descriptors file: 4096
ModemManager[671]: opening device...
ModemManager[671]: opening device...
ModemManager[671]: [/dev/cdc-wdm0] Read max control message size from
descriptors file: 4096
ModemManager[671]: [/dev/cdc-wdm0] Read max control message size from
descriptors file: 4096

Is this a bug? Even launching with

ModemManager --log-level=ERR > /dev/null 2>&1

the messages still appear. How can I get rid of them?
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