Mabe you discovered a problem in the beta with activating the mqtt API (which requires WiFi) while the SL3P is connected to a bridge (and the internal WiFi is off). I’ll forward this to the firmware team.
Inbetween i’d recommend to not activate the mqtt API (= debug mode) while the Smart Lock is connected to a bridge.
To recover the bridge you need to set it up and pair it with the Smart Lock again through the Nuki App > Manage Devices > Add Bridge section. You could also activate and set up the HTTP-API through the App and don’t need auto-discovery in this case.