Volumetric Light Scattering Turning ClearColor Black

There is no errors everything is rendering fine but the background is turning black instead of being transparent i saw a similar issue on the forum in the following link

https://forum.babylonjs.com/t/how-to-set-alpha-to-volumetric-lightscattering-post-process/7576?u=karim_salam

The code is a really simple one its just the scene the camera the model and this vls

Let me clarify the problem is that the vls is turning the clearcolor full black instead of transparent