Trigger collision with multiple objects suddenly becomes unreliable.

The game I'm working on right now has a cursor that's made out of multiple blocks tied together. The basic idea being that you can switch between different cursor shapes in order to clear out an area.

I'm using collision triggers to detect if any part is over a tile to clear out, and that works perfectly when it's just one piece. But if there's any more than one, sometimes it just doesn't trigger for some of them. It seems very random, sometimes all the pieces $$anonymous$$t no problem, and then suddenly one or two of them don't work.

Here's most of the code of the individual pieces (w$$anonymous$$ch are instantiated by the main cursor object)

         private void OnTriggerEnter2D(Collider2D other)
         {
             if (other.tag == "tile")
             {
                 tile = other.gameObject;
             }
         }
     
         void OnTriggerExit2D(Collider2D other)
         {
             if (other.tag == "tile")
             {
                 tile = null;
             }
         }
     
     
         // Update is called once per frame
         void Update()
         {
             //sets position relative to mouse and follows it
             float spriteSize = 0.64f;
             float parentPosx = Mathf.RoundToInt(transform.parent.position.x / spriteSize) * spriteSize;
             float parentPosy = Mathf.RoundToInt(transform.parent.position.y / spriteSize) * spriteSize;
             transform.position = new Vector2(parentPosx + xOffset, parentPosy + yOffset);
     
             //prevents cursor from going too far left
             if(transform.position.x < -4.48f + xOffset)
             {
                 transform.position = new Vector2(-4.48f + xOffset, transform.position.y);
             }
     
             
             if (Input.GetMouseButtonDown(0) && tile != null)
             {
                 Destroy(tile);
             }
     
         }