transform.localScal not flipping

I am unable to get this example of the localScale to flip a player and it is not working in Unity 2020.

I found out that the animator is causing the issue.

 private void Update() {

     // Animation features

     if (Mathf.Abs(mx) > 0.05f) {
         anim.SetBool("isRunning", true);
     } else {
         anim.SetBool("isRunning", false);            
     }

     anim.SetBool("isGrounded", IsGrounded());

     // Facing Right or Left

     if (mx > 0f) {
         transform.localScale = new Vector3(1f, 1f, 1f);
     } else if(mx < 0f) {
         transform.localScale = new Vector3(-1f, 1f, 1f);            
     }

     anim.SetBool("isGrounded", IsGrounded());
 }

 private void FixedUpdate()
 {
     Vector2 movement = new Vector2( mx * movementSpeed, rb.velocity.y);

     rb.velocity = movement;
 }
 
 void Jump() {
     Vector2 movement = new Vector2(rb.velocity.x, jumpForce);

     rb.velocity = movement;
 }

}

When animator is active the character does not flip unless update mode is set to animate physics. This does not work as the player becomes very choppy when running.