Battery powered Ikea Thread devices fail to reconnect after mains power outage

I had a power outage and my Matter devices (Bilresa, Myggbett) failed to reconnect.
According to Copilot AI, this is because my Samsung phone had Nearby Device Scanning turned on during the outage and this scans and connects to Matter devices. This essentially took over the role of my ZBT-2 OTBR and stopped the Ikeas devices from ever reconnecting to it.
Apparently I now have to factory reset these Ikea devices!
Any thoughts or suggestions?