I just tested again, Both 32 bit Buster and 32 bit Bullseye dated Jan 2022 from RaspberryPi.com
I added ssh.txt and wpa_supplicant.conf to the boot partition prior to putting in my RPi4-8GB (with Argone One V2 case)
It booted up normally in both cases. I then did the sudo apt update && sudo apt upgrade -y in both Buster and Bullseye setups (in case either replace the existing /boot/config.txt during updates)
I modified /boot/config.txt, adding dtoverlay=disable-wifi as the last line, in both situations, and rebooted multiple times.
The WLAN0 is not listed in any reboot.
I then inserted the Wifi dongle. It shows up as WLAN0, shows in command lsusb
I then rebooted and tested again, multiple times, and only WLAN0 (the dongle) shows up. This was tested on both the Buster and Bullseye, multiple times. I also tested with a Pi3B+, same setups, same modified /boot/config.txt, same results. It's weird that yours brings back the
on board WiFi, as I cannot reproduce it.
Kevin -- KD9EFV
