Colour Changing Virtual Dimmer

I use a few virtual dimmable RGBW bulb devices to act as a single controller for multiple lights. My kitchen lights can then all be controlled as a group. I have a single piston that responds to changes in the virtual bulb and sets the physical lights. Works great at dimming, on/offing and changing colour temperature but there doesn’t seem to be the ability to respond to a change in the colour. of the virtual bulb. Is this a bug @ady624?