Steps to reproduce:

1. Download and import attached project.
2. Open scene: main.
3. Press play.
4. In hierarchy select particle system
5. Change 3D start rotation value between true and false
6. In inspector, over "Show Rotation (Script)" component, inspect values.

Expected result: 3D Start Rotation should not affect angular velocity over lifetime.
Actual result: Angular velocity changes, when ticking 3D Start Rotation

Reproduced on: 5.5.0a1 June 9, 5.4.0b22