Clipping plane edges don't correspond to display mode

I have created a simple black and white display mode where I also changed the settings for the clipping plane, and still it won’t show the correct colors. Instead of black it’s showing up gray. You can see in the image below. This is also my first time using these settings so I’m not so sure how this is supposed to work and what I’m doing wrong.
I’m using Rhino 8 on Windows with VisualArq.

Hi Kaltra -
Is this issue limited to VisualArq objects?
If not, please export the custom display mode and a simple 3dm file that shows the issue.
-wim