Count and find NON-PERSISTENT UnityEvent listeners: How?

Is there any way to find out how many and which listeners have suscribed to a UnityEvent at runtime? There's methods like GetPersistentEventCount etc., but I am looking for NON-PERSISTENT listeners.

Context: I'm checking if anyone's subscribed to an event before firing it and it always returns true, even though it shouldn't:

  public static UnityEvent UnshieldReds     = new UnityEvent();
 //somewhere else stuff subscribes, unsubscribes when adequate
 
 public void UnshieldRedEnemies() {
         if ( redsShielded ) {
 //this always returns true, even though persistent event count is 0
             if ( UnshieldReds != null ) {
                 UnshieldReds.Invoke();
                 shieldsDownSound.Play();
             }
             redsShielded = false;
         }
     }

In the given example, UnshielReds is invoked even though there are no red enemies with shields around that could have subscribed to the event, which is puzzling me. There must be a way when using the observer pattern to find observers, right?