Question SetBool not working on Unity 2020.3.32f1.

I have this piece of code:

Code (CSharp):

1.    protected void DoWalk() {
2.       if(!walking) {
3.          animator.SetBool("Walk",true);
4.          walking = true;
5.       }
6.    }

I was working with Unity 2020.3.22f1 and never had trouble with it, but since we moved to Unity 2020.3.32f1 SetBool sometimes works and sometimes it doesn't. If I open the project with 2020.3.22f1 it works 100% of the times, but I'm part of a team so downgrading is not an option... we're using github for version control in case that matters.

Any ideas?