Bug in rotation when going to opposite quadrant

Hi All,

I have been breaking my head on this problem. The behavior I want to achieve is to rotate the player(up vector) towards the target position (which is mouseclick).

Seems to be quite simple and I have got it working except for a bug. So, for every click of mouse, I set the targetPos to the mouse position. I also set the scale of the player to +ve or -ve depending on the targetPos. Then I start the below coroutine to rotate and move the player to the targetPos. A correction has been added for the scaling when moving in opposite direction.

The player rotation is ok when the click is in y<0. The problem happens when I click in a y>0 region and only when the previous click in the opposite quadrant with respect to the player. The weird part is that if I click again (while the corouting is running), the rotation becomes correct.

I can't seem to figure out the bug in the code. Please help!

Here is the scaling code

 transform.localScale = new Vector3(playerXScale * Mathf.Sign(transform.position.x - targetPos.x), 
                                                 transform.localScale.y, transform.localScale.z);

And here is the rotation ad movement coroutine

 //transform.rotation = Quaternion.Euler(0f, 0f, 0f);
         Vector3 diff = targetPos - transform.position;
         diff.Normalize();
         float rot_z = Mathf.Atan2(diff.y, diff.x) * Mathf.Rad2Deg;
         float eulerZ = 180 * (1 + Mathf.Sign(transform.localScale.x)) / 2;
         transform.rotation = Quaternion.Euler(0f, 0f, rot_z - eulerZ);
 
 
         while (Vector3.Distance(targetPos , transform.position) > 0.05f && transform.position.y<=0)
         {
             transform.position = Vector3.MoveTowards(transform.position, targetPos , speed * Time.deltaTime);
             
             yield return null;
         }
         transform.rotation = Quaternion.Euler(0f, 0f, 0f);

Edit1: Here is a standalone monobehaviour that you can use to attach to a game object to debug. This does show similar bug but clicking twice rotates the player again.

 public class test : MonoBehaviour
 {
     Vector3 targetPos;
     float playerXScale;
 
     private void Start()
     {
         targetPos = transform.position;
         playerXScale = transform.localScale.x;
     }
 
     // Update is called once per frame
     void Update()
     {
         if (Input.GetMouseButtonDown(0))
         {
             targetPos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
             targetPos.z = transform.position.z;
             StopAllCoroutines();
             StartCoroutine("doMove");
         }
 
         transform.localScale = new Vector3(playerXScale * Mathf.Sign(transform.position.x - targetPos.x),
                                                 transform.localScale.y, transform.localScale.z);
     }
 
     IEnumerator doMove()
     {
         Vector3 diff = targetPos - transform.position;
         diff.Normalize();
         float rot_z = Mathf.Atan2(diff.y, diff.x) * Mathf.Rad2Deg+90;
         float eulerZ = 180 * (1 + Mathf.Sign(transform.localScale.x)) / 2;
         transform.rotation = Quaternion.Euler(0f, 0f, rot_z - eulerZ);
 
         while (Vector3.Distance(targetPos, transform.position) > 0.05f)
         {
             transform.position = Vector3.MoveTowards(transform.position, targetPos, 2 * Time.deltaTime);
             yield return null;
         }
 
         transform.rotation = Quaternion.Euler(0f, 0f, 0f);
     }
 }