In my experience, the network icon just keep blinking until it ended up to no internet connection.Internet is available again after the Windows installation (once you reach the desktop)
I think I figured out what caused it. I found out that DNS cache is disabled after it reached desktop so I squeezed in a registry entry to set it to automatic in my post-install and it worked after a single reboot. I checked NTLCleanup.cmd that was auto generated, the script has a service command to start DNS cache but I don't why it doesn't work the way it supposed to.I'll test it with the ethernet cable, to see.