I have a network-wide pi hole and I noticed that it requested activity.windows.com, a url blocked by my pi hole, even while my pc is suspended. I pinged 10.0.0.217 and it is currently unreachable. So, somehow, windows pc’s turn on networking, phones home, and turns off even while suspended.
Creepy behavior
Here’s Microsoft’s information page on it:
https://learn.microsoft.com/en-us/windows-hardware/design/device-experiences/modern-standby