Steps to reproduce:
1. Open the attached project(PathBug.zip)
2. Open the Assets/BadPath.unity scene
3. Play the scene (Ensure the Navigation Window is selected in the Editor)
4. Observe the Console Window and the Navigation Window:
A valid NavMesh is produced which covers and links both red points
No path is found between the two red points
The logging shows the NavMesh is valid, the two red points are valid, but the is no path found

Expected result: CalculatePath() should find a path between two valid connected locations
Actual result: CalculatePath() fails to find a path between two valid connected locations

Reproduced with: 2017.1.0b9, 2017.1.0b10, 2017.2.0a4
Not reproduced with: 5.5.4p1, 5.6.2f1, 2017.1.0b8
Regression introduced in: 2017.1.0b9