How to switch between procedural animation to Mecanim / Animator animations

Hi! I'm doing a real time lipsync script by animating bones procedurally while the voice audio is playing. So far everything OK. The problem comes when audio finishes, I want the bones to move according to what the current animation clip indicates.

What I see is that, if I override a bone transform in LateUptate() once, then the bone won't restore its transform values according to what the current animation clip indicates anymore.

Let me show you the very basic code example:

 public Transform boneToOverride;    // It has assigned the desired bone
 public bool overrideAnimation;    // it should let me switch between procedural and clip animation
  
 void LateUpdate() {
      if (overrideAnimation) {
            boneToOverride.position = new Vector(some, procedural, value);
     }
 }

I read that the legacy Animation component, applies clip animations after Update() and before LateUpdate(). It seems to me that it doesn't work like this for the Animator component.

I would appreciate if you could help me on this.

Thank you!