I confirm that the problem persists despite the installation of version 20h2.
In our case when the proxy is activated we have the indication that we do not have internet.
If the proxy is not activated on the same computer, we have no problem.
If I put a laptop on a docking station with an ethernet link, windows indicates that I have internet. If I remove the pc from the docking station and switch to wifi, the pc indicates that I no longer have internet when I can go on the internet without any problem.
The only change is my ip address.
I did not try to put fixed ip knowing that I have in addition to ip reserved in my dhcp so my pc never changes address
All PCs in 1909 or later no problem whether or not they have the proxy