Reproduction steps:

1. Open "MaschineKart.zip" project
2. In the Hierarchy window select "Kart"
3. In the Inspector window scroll down to "Kart Controller (Script)" -> "Suspension Force"
4. Enter Play mode
5. Increase the "Suspension Force" from '100' to '10000'
6. See that nothing happens
7. Revert the "Suspension Force" back to '100'
8. In the Game window click on the "Kart"
9. Increase the "Suspension Force" from '100' to '10000'
10. See that the "Kart" starts to move around from the force

Expected Result: The same that happens at step 10, should happen at step 5 (Both times the "Kart" should move around as the force is increased, but it only happens after an outside force first affects the "Kart")
Actual Result: Only after an outside force affects the "Kart", does the "AddForceAtPosition" actually affect the cart

Reproduced with: 2018.1.0b3, 2017.3.0p2, 2017.2.1p2, 2017.1.3f1