If you use any backup disks, such as Airport Extreme and/or Time-Capsule (with wifi) can someone please check if you also have this bug that appeared for me when I updated from Catalina to Big Sur (11.0.1).
Open Air-Port Utility, click on any of the backup disks shown on your network and report whether against 'wireless clients' the text looks more like Morse code than an IP address or computer name.
Open Air-Port Utility, click on any of the backup disks shown on your network and report whether against 'wireless clients' the text looks more like Morse code than an IP address or computer name.