Problems with temperature settings in AVM thermostats

Hi there
I’ve gotten the integration to Google assistant to work via the HA-cloud, I gave up on doing it via actions, I couldn’t make it work.
But I have some challenges with setting the temperature.
I can set it to a different temperature, but then the ‘mode’ of the thermostat is changed to ‘manual’, which then hinders the change in temperature to be repeated, as that state is not known in Google Home (only ‘warming’, ‘eco’ and ‘off’ are shown).
It seems that I can usually change the mode, to ‘warming’ or ‘eco’ and then set the temperature again if I wish, but it seems quite awkward.
Why does it change the ‘mode’, and then disables the temperature change afterwards?