This is expected behavior due to the Crestron Home architecture. Although the original KNX file may contain room subdivisions, objects created within the driver cannot be automatically assigned to the Crestron project areas.
Solution: After saving the configuration in the driver, open Crestron Home Setup, go to the "Pair Devices" section, select the desired room in the right panel, and manually add the devices (listed under the KNX driver) by pressing the "+" button.