https://wccftech.com/microsoft-blocks-latest-windows-10-version-2004-for-some-more-devices/

Just when we thought Windows 10 May 2020 Update was out of the woods, Microsoft has put yet another compatibility block on the latest version of the operating system. The company added a new bug in the list of known issues that prevents "certain WWAN LTE modems" from connecting to the internet.

"After waking from sleep or hibernation, certain WWAN LTE modems might show no internet in the Network Connectivity Status Indicator (NCSI) in the notification area and might be unable to connect to the internet," Microsoft writes (via ZDNet) in a support document for Windows 10 version 2004.