Edit Surface Volume handles are in random locations in space

To reproduce:
1. Open attached project
2. Open Untitled.unity scene
3. Select Cube game object in hierarchy
4. Click Edit Volume button found on NavMeshSurface Component/Script
Expected result: The handles for editing the volume are always on the walls of the volume
Actual result: Some of them are further out in space

Attached screenshot with this is attached as "Screen Shot 2015-12-01 at 18.20.00.png"

Screencast: http://screencast.com/t/IswVVyhST

Bug found in:
Version 5.4.0a5 (806f333a7d81) Personal
Mon, 30 Nov 2015 22:54:41 GMT
Branch: ai/navmesh/builder