Blocking Volume Not Displaying Properly in Player Collision Mode

The licensee has stated that convex mesh generation is failing in KAggregateGeom.cpp from the function KConvexElem::HullFromPlanes.

Here is the code snippet they provided:

 if(!Polygon.Split(-FVector(InPlanes[j]), InPlanes[j] * InPlanes[j].W))
 {
     Polygon.Vertices.Empty();
     break;
 }

I have attached screenshots showing the differences between the two versions. 
 

1. Open the editor
2. Paste in the clipboard value of the broken brush actor from the attached .txt file
3. Move the BlockingVolume2 to 0,0,0
4. Change the view mode to player collision

Result: Notice the differences in display between 4.12.5 and 4.13.

Expected: The display would be the same between both versions.