Steps to reproduce:
1. Open user attached project "Navigation Demo.7z"
2. Observe the red block moving and the cube moving with it (position manually updated)
3. Compared to the blue block moving and the cube staying in place (vanilla Nav mesh Agent with rigidbodies)

Expected: When you use a nav mesh agent with a rigidbody, it should update the collisions and physics required for the block to move with it
Actual: It's being moved without updating the physics calculations

Reproduced on: 5.6.5p1, 2017.1.3f1, 2017.2.1p3, 2017.3.0p4, 2018.1.0b5

Note: Same can be experienced if you comparing moving a kinematic rigidbody with rigidbody.movePosition(works) with moving a kinematic rigidbody with updating it's transform.position value (doesn't work)