When I update my radiator's desired temperature, it's not updating in the HA dashboard

[mysliwiec-tech]

I've been struggling with it since the beginning. I've got Devolo Thermostats installed and working correct. The only issue that I'm having is, once I go to the dashboard and setting the desired temperature using arrows, it sends the update to HA, but the UI is not reflecting a change. It only updates after the device pushes the update to the controller (so in next 5 min as this si my pooling interval).

It causes eg. Google Home not showing the desired state which I just set, but the one that device was working in before my change. That confuses the user in whether the change was ack by a server or not.

From what I googled, I think it might be related to "Optimistic mode", but do not really know how can I change that. Any hints?