That might simply be due to Windows' just plain dropping driver support. It happened with many laptops that had Mediatek chipsets. The WiFi 6 chipsets were being limited to 100Mbps or 54Mbps. One way to confirm it would be to boot Linux (no need to install it, just boot a linux ISO), and check your internet connectivity. If it works, then that would confirm it.
That being said, I think only Ant Esports, Zebronics and the like make motherboards for older gen CPUs now.
I know that since I was looking for one too. They're okay, I suppose. Might pick one up, since they're so cheap anyway.
