How to reproduce:
1. Open the user's attached project
2. Open scene GrassSpeedBug/GrassSpeedBug
3. Select the GameObject "Bug" in the Hierarchy window
4. In the Inspector view under "Grass Speed Bug (Script)", set the Mode to "None"
5. Press the Play button
6. Observe the grass animation speed in the Game view
7. Press the Play button again to stop the game
8. Set the Mode to "Render Camera"
9. Press the Play button
10. Observe the grass animation speed
11. Press the Play button again to stop the game
12. Set the Mode to "Render Cubemap"
13. Press the Play button
14. Observe the grass animation speed

Expected result: grass movement speed always stays the same
Actual result: grass movement speed increases around twice on Camera.Render(), and increases several times more on Camera.RenderWithCubemap()

Reproducible with: 2019.4.29f1, 2020.3.16f1, 2021.1.17f1, 2021.2.0b7, 2022.1.0a5

Notes: not reproducible in the Scene view