URP Post-Proccess profile bug

Hi Unity Team!
I try to change some variables in profile in runtime, but it also change profile asset. I use this code:

Code (CSharp):

1. ColorAdjustments colorAdj = null;
2.  
3. bool isFound = Camera.main.GetComponent<Volume>().profile.TryGet<ColorAdjustments>(out colorAdj);
4. if (isFound) colorAdj.saturation.value = -100;

As I know, that .profile - it is instanced profile, and .sharedProfile - it is asset profile, so if I change instanced .profile it should have changes only runtime.

I think it is bug. I Use Unity 2019.3.0b3 with URP 7.0.1
Thanks!

 

This still happens... anybody an explanation why?
Crazy thing is that it seams just to be in the memory in our case, because the values are reset again once I restart the editor (Unity 2020.3.1f1).