The project has a Particle System which has Inherit Velocity. The particle system is constantly started/stopped using Play and Stop functions. The first particle goes in wrong directions each time Play is started (assuming that all the particles from last time already disappeared)

To reproduce:
1. Open attached project
2. Open bugExample scene
3. Enter play mode
4. Use z, left, right to move around.
Expected result: particles always shoot correctly
Actual result: if there's no particles on the screen and you hit z, the first particle flies in a wrong direction