NOT RESOLVED 😞
A reboot causes the thunderbolt bridge virtual interface to be recreated, from that point onwards WiFi Spoof can only see the WiFi adapter and the (fairly pointless) thunderbolt bridge.
The virtual interface containing only the thunderbolt ethernet adapter is still visible (and active) in the network settings but WiFi spoof can nolonger see it. For some reason it seems to be eclipsed by the bridge no matter what you try (and I've tried everything that I can think of).
Any suggestions or help would be greatly appreciated, I've ran out of ideas.