Reproduction steps:
1. Open the attached project "961760.zip";
2. Open the CSGErrorExample scene;
3. Make sure that the Gizmos are drawn;
4. Enter a Play mode;
5. Observe that the Capsule Collider is animated to move around the FBX model and when it moves, red and green crosses appear.

Expected results: When Capsule is moving, we should see only green crosses, which mean that ComputePenetration gives back a penetration distance.
Actual results: We can observe that red crosses also appear, which mean that OverlapCapsuleNonAlloc returns a collision when there clearly isn't one.

Reproduced on: 5.6.3p4, 2017.1.2p1, 2017.2.0p1, 2017.3.0b7. 2018.1.0a2.

Fixed in PhysX 3.4.