The REGDOMAIN in /etc/default/crda is not set, thus WiFi channels 12 & 13 can’t be used in the EU.
The user should be able to configure this in the settings.
Could you open an issue please, so we can track it?
It’s possible that this is what’s causing this:
rpi-onboard-wifi-vanishes-when-disabled-t6125.html
If so, good catch!