Bosch Smart Home change "setpoint-temperature"

Dear Community,

Today, I updated my OpenHAB system to version 4.3.1 and adjusted all settings accordingly. While the system seems to work overall, I am encountering an issue with the Bosch Smart Home Binding. I can read all values from my radiator thermostats, but transferring temperature values to the thermostats “setpoint-temperature” does not work. There are no error messages in the OpenHAB log—the changed value is displayed correctly in OpenHAB but is not passed to the thermostat (this setup worked flawlessly in OpenHAB 3 until yesterday). I’m desperate for help and appreciate any feedback.

Item: 
//heizung 4
Number      Thermostat_B_Ist       "Ist Termperatur Büro"                <temperature>      (Kinderzimmer)           {channel="boschshc:thermostat:1:Thermostat_B:temperature"}
Number      Thermostat_B_Soll      "Ventilöffnung Büro"                  <radiator>         (Kinderzimmer)           {channel="boschshc:thermostat:1:Thermostat_B:valve-tappet-position"}
Number      Climate_B_Ist          "Ist Termperatur Büro"                <temperature>      (Kinderzimmer)           {channel="boschshc:climate-control:1:Climate_B:temperature"}
Number      Climate_B_Soll         "Soll Temperatur Büro"                <radiator>         (Kinderzimmer)           {channel="boschshc:climate-control:1:Climate_B:setpoint-temperature"}

Thank you in advance!