Service SDK does not allow empty twin property value with twin update

Hi,
when we try to delete a twin field by setting the property value to string null(empty), we get exception from the service SDK:
"ErrorCode: ArgumentInvalid; Value of Property or Tag cannot be null. Error in Property/Tag version Tracking"

Since IotHub allows empty property value, does not it need to supported from the service SDK side?
Also, just to confirm, the property will be removed from the twin after the request is successful as seen in the IoTHub?