Dear maintainer, I have some other details about this bug. It seems that it occurs when SIM of mobile broadband is protected by a PIN. If I remove PIN I'm able to connect after device is attached and automatically mounted. I think there could be a "delay" from which device is unlocked (if sim is protected) and network manager loads the configurations for the connection. Maybe this can help you to investigate more. If I you need any other details please don't hesitate to comment this issue. Thanks a lot. With Regards.
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