How to reproduce:

1. Open attached project
2. Open scene scene.unity
- Scene has a script attached to the camera which simply prints, in order: Time, Camera.aspect, calculated aspect
3. Play the scene
4. Pause it
5. Change the aspect ratio/size in the game view
6. Click the next frame button a couple of times
- Notice how the manually calculated aspect ratio is updated first, while the Camera.aspect is still in its old state
- In the next frame they are both the same again