UnityEvent is not being heard by some objects

I have some projectile code subscribed to an event ("BossDied") and I can't figure out why they aren't firing the function.

Things I've tried:

• I've used Debug.logs to check that they are being enabled and disabled properly. (Getting proper log messages when the objects are instantiated and destroyed)

• I subscribed to the event from another script on a GameObject that
  is instantiated at runtime. And here the dummy function I created is working.

  ---

  ---

  public class XamoidProjectile : MonoBehaviour {

     private void OnEnable()
       {
           EventManager.StartListening("BossDied", DestroyProjectile);
           Debug.Log("start listening" + this.name);
           
       }
   
       private void OnDisable()
       {
           EventManager.StopListening("BossDied", DestroyProjectile);
           Debug.Log("start listening" + this.name);
   
       }
   
   
       public  void DestroyProjectile()
       {
   
           Debug.Log("DESTROOOYYYY!!");
         
   
   
       }
   
       
  
  

public class BossMachine : MonoBehaviour {

 public virtual void BossDied()
     {
         Debug.Log("Boss is dead");
         EventManager.TriggerEvent("BossDied");
         bossIsDead = true;
 
 }

}