When a widget component is using it's own bounds scale the value doesn't appear to have an effect in the editor. To verify this I added a parent component and used it's bounds scale with the same value and got different results.
Plane on the left gets culled when occluded by the wall
Plane continues to render after being occluded by the wall
Plane on right doesn't get occluded because it is using the parent component to calculate bounds scale
Head over to the existing Questions & Answers thread and let us know what's up.