I recently bought a second Thermostat and 3-pak climate sensor. I successfully connected one sensor to my older t-stat. But I could not connect the other two to my newly installed t-stat.
To double check everything, I tried the two that would not connect on the new one and tried them on the original t-stat and they connect. So the issue is with the newest t-stat. Both have the 1.2.1 firmware
Welcome to the community. That is a little strange that they’re both on the same firmware and one is acting differently.
I would contact Wyze so they can walk you through the troubleshooting steps.
I wouldn’t be surprised if something like resetting it back to factory, removing and re-adding it helps. Maybe one of them has a slightly different setting? Or maybe they just need to give you a replacement.