On my laptop, with Windows 10 1903 I have a GSM modem Ericsson H5321. When the Prevent malicious network traffic with packet inspection option is enabled, the connection to the GSM network is active but has the status No internet access. When connected via a wifi or LAN network everything works fine.
Connect via GMS modem works only after disabling the Prevent malicious option in Threat Protection policy.
Thank you for reporting this issue. It looks like this might be the same issue as with the Wi-Fi adapters. I will forward it to the team and see if they can look into it.
I have received the SDU log, thank you.