To reproduce:
1. Open attached project
2. Open test scene
3. Press play
4. Start pressing spacebar with interval about 1-2 seconds
5. Notice that particles sometimes are randomly blinking
6. Stop scene
7. Disable one of "side template pillow" game objects (gameobject -> side template pillow)
8. Press play and start pressing spacebar
9. Notice that now particles don't blink. Particles are blinking when there are two identical particle systems in the scene.