ComfoAir Bindind Openhab 3 Target Temperatur could not set with decimals

Hello everyone,

i have a strange thing with my Comfoair Binding.

When i set the target temperature to a number with xx.0 everthing is fine, but as i set e.g. 22.5 °C i get with the next refresh 22.0 °C back. at the ventilation the target temperatur stays at 22.0.

If i set the temp at the ventilation system to 22.5 i get back in openhab the 22.5. but i can not set it via openhab.

some one an idea for this???