Question Invoking UnityEvents from within a StateMachineBehaviour is not working (all members are null)

What I'm trying to do:

Since I can't simply ask an Animator if a state machine is inside a certain Substatemachine or not, I wrote a StateMachineBehaviour script that monitors the access and triggers events when entering/exiting the monitored states (I need to manually update a string list by hand with the names of the monitored states and I don't think there is a better/easier solution).

My problem:

I subscribe to these events from within another StateMachineBehaviour script that sits on the same State. However when the callbacks are exectuted, all members inside the callback are uninitialized/null.

This is how I invoke the events:

Code (CSharp):

1. public class SubstatemachineMonitorAccess : StateMachineBehaviour
2. {
3.     public SubstatemachineMonitorEvent OnSubstatemachineEntered;
4.     public SubstatemachineMonitorEvent OnSubstatemachineExited;
5.  
6.     [SerializeField] private List<string> monitoredStatesInsideSubstatemachine;
7.  
8.     [System.Serializable]
9.     public class SubstatemachineMonitorEvent : UnityEvent<Animator> { }
10.  
11.     private readonly List<int> monitoredStatesHashes = new List<int>();
12.     private bool active = false;
13.  
14.     private void Awake()
15.     {
16.         foreach (string state in monitoredStatesInsideSubstatemachine)
17.         {
18.             monitoredStatesHashes.Add(Animator.StringToHash(state));
19.         }
20.     }
21.  
22.     override public void OnStateEnter(Animator animator, AnimatorStateInfo stateInfo, int layerIndex)
23.     {
24.         int stateHash = animator.GetNextAnimatorStateInfo(layerIndex).shortNameHash;
25.         if (!active && monitoredStatesHashes.Contains(stateHash))
26.         {
27.             OnSubstatemachineEntered.Invoke(animator);
28.             active = true;
29.         }
30.     }
31.  

I register the callback functions that are defined in another StateMachineBehaviour script that sits on the same state. I do this through the editor (the Inspector dropdown menus that were created for the public SubstatemachineMonitorEvents).

But inside that callback, everything is uninitialized:

Code (CSharp):

1. public class KombatState : StateMachineBehaviour
2. {
3.     private string test;
4.  
5.     private void Awake()
6.     {
7.         Debug.Log("Awake");
8.         test = "Test";
9.     }
10.  
11.     public void OnSubstateMachineEnter(Animator animator)
12.     {
13.         Debug.Log("Callback");
14.         Debug.Log(test);
15.     }
16. }
17.  

The test variable is not initialized, even though Awake has been called before the callback is executed.

Am I doing something wrong or missing something?