PLEASE REMOVE ALL CONFIGURATION.YAML BetterThermostat CONFIGURATIONS BEFORE UPDATE!
This Beta brings the big change in structure, so Zigbee2Mqtt isn't a requirement anymore, Better Thermostat supports now all TRVs in basic, as long as they are normal integrated in Home Assistant (climate entity)
The Configuration over the configuration.yaml is deprecated with this release and must be removed before update. Instead, Better Thermostat uses the well-known Home Assistant config flow in the Integrations tab.
A big thanks to all supporters and tester, you help a lot. If you have opened an issue, please check if It's still an issue after this update.