event trigger on 2 separate buttons

I am not sure why it is acting the way you described, as I have never run into a need to do what you are doing, but a co-routine will run separately from the main thread, which is why I suggested it.

now I'm trying to figure out these coroutine setups for button down, button hold and button up...

here's an example or what I have running for one button: and the opposite value for the other button...

the event triggers control the functions, but once the other button is pressed, it cancels this out...vice versa

public void OnMouseDown() {

         ispressedB = true;

         GameObject[] Flippers;
         Flippers = GameObject.FindGameObjectsWithTag("Flipper");
         foreach (GameObject flipper in Flippers)
         {
             flipper.GetComponent<Rigidbody2D>().MoveRotation(80);
         }
 
 }

  
 public void WhileHolding()
 {
     if (ispressedB == true)
     {
         GameObject[] Flippers;
         Flippers = GameObject.FindGameObjectsWithTag("Flipper");
         foreach (GameObject flipper in Flippers)
         {
             flipper.GetComponent<Rigidbody2D>().MoveRotation(80);
            
         }
     }
     
 }

 public void OnButtonRelease()
 {
     ispressedB = false;
     GameObject[] Flippers;
     Flippers = GameObject.FindGameObjectsWithTag("Flipper");
     foreach (GameObject flipper in Flippers)
     {
         flipper.GetComponent<Rigidbody2D>().MoveRotation(0);

     }
 }