"Connected to new network", but the network is not new

Avast Free Antivirus / Premium Security
1

I am connected to my home WiFi network. I don’t change anything in the router or in Windows settings, still often (maybe always, I’m not sure) when I start the computer, I get the “Connected to new network” message.
Why does Avast think, the network is new?

https://i.imgur.com/FdMypo4.png

  • In Windows Settings > Network & internet > WiFi > Hardware properties the value of Physical address (MAC) is unchanged. I.e., the computer’s MAC address is the same all the time.
  • Taking the first IP address in the output of tracert 8.8.8.8 and searching for it in the output of arp -a gives the same MAC address all the time. I.e., the router’s MAC address is also unchanged.

Avast Free Antivirus 24.9.6130 (build 24.9.9452.875)
Windows 11 Pro, 23H2, build 22631.4169