Child position not updating immediately?

I want to attach a GameObject to my player as soon as they touch, because I want this object to "follow" my player (as if they are holding it). This is the code I attached to my player:

 void OnCollisionEnter2D(Collision2D collision) {
 
 collision.collider.enabled = false;
 collision.rigidbody.isKinematic = true;
 collision.transform.parent = this.transform;
 collision.transform.localRotation = new Quaternion();
 collision.transform.localPosition = new Vector3(0.5f,0,0);
 
 }

When my player runs into the object it gets stuck in its current position and is jittering for ~1/2 second. Then it starts followig the player from there. Since the player moved in that time it is not in its desiered positon, but somewhere far behind the player.

Thanks.