DONEXON varmo TZ pro - climate group fails

[Cico1978]

Hi, I'm asking for help as I had a few (4) "DONEXON varmo TZ pro" running and recently the Better Thermostat UI card did not show any values of group thermostats any more. (also not on the info page, while the entities them self seem to be fine)

My first attemtp worked for a short while. In this case I combined both by adding both Thermostat entities within the Better Termostat configuration.
Next attempt was a setup of a climate group of both thermostats and putting this into the Better Thermstat configuration.
At some point non of my BTs where shown on the dashbord any more and I remved the whle package, downloaded it again and set it up as before and the singel Thermostats are doing fine but hte combined one is not working at all and I'm also not able to put 2 single devices in place. ... this might be related to the climate group.

config_entry-better_thermostat-d0f82c490fa1dc4a1ba6d411639789a1.json.txt

Any Idea on how too solve that with this Hardware?