I'm trying to render a foggy lake scene (Blender 2.8 with Cycles). The entire scene is placed inside a cube with a volume scatter material, the lake is just a glossy plane. The lighting comes from a large area light in the back pointing directly at the camera. Here is the setup (the ellipse is the area light):
Here is the rendered result:
As you can see, the lake reflects the light directly (bright region in the center), without any scattering applied... how can I get the water to actually reflect the fog?