To reproduce:
1. Open attached project;
2. Run scene Main;
3. Enter Play mode;
4. In Hierarchy create one more Quad;
5. In the game window use WASD/ right mouse button to navigate on Quads;
6. Check how the ball is flickering on the second Quad.

Actual result: Ball is flickering on the second Quad.
Expected result: Ball should move as smooth as on the first Quad.

Reproduced in: 5.4.5f1; 5.5.1f1; 5.6.0b11; 2017.1.0a2