Question Loading ref on [UnitySetUp] make test fail

Can someone explain to me why this work

Code (CSharp):

1. public class InputListenerTests : InputTestFixture
2. {
3.     private InputListener inputListener;
4.  
5.     [UnityTest]
6.     public IEnumerator When_PressW_SelectedHighBattleActionEventRuns()
7.     {
8.         // Arrange
9.         inputListener = new GameObject().AddComponent<InputListener>();
10.         yield return inputListener.LoadBattleActions();
11.        
12.         var keyboard = InputSystem.AddDevice<Keyboard>();
13.         var hasTriggeredHighEvent = false;
14.         inputListener.OnSelectBattleAction += ctx =>
15.         {
16.             hasTriggeredHighEvent = string.Equals(ctx.BattleAction.name, GameConstants.BattleActions.HIGH_NAME);
17.         };
18.  
19.         // Act
20.         Press(keyboard.wKey);
21.         yield return null;
22.        
23.         // Assert
24.         Assert.That(hasTriggeredHighEvent, Is.True);
25.     }
26. }

And this does not

Code (CSharp):

1. public class InputListenerTests : InputTestFixture
2. {
3.     private InputListener inputListener;
4.    
5.     [UnitySetUp]
6.     public IEnumerator Init()
7.     {
8.         inputListener = new GameObject()
9.             .AddComponent<InputListener>();
10.    
11.         yield return inputListener.LoadBattleActions();
12.     }
13.  
14.     [UnityTest]
15.     public IEnumerator When_PressW_SelectedHighBattleActionEventRuns()
16.     {
17.         // Arrange
18.         var keyboard = InputSystem.AddDevice<Keyboard>();
19.         var hasTriggeredHighEvent = false;
20.         inputListener.OnSelectBattleAction += ctx =>
21.         {
22.             hasTriggeredHighEvent = string.Equals(ctx.BattleAction.name, GameConstants.BattleActions.HIGH_NAME);
23.         };
24.  
25.         // Act
26.         Press(keyboard.wKey);
27.         yield return null;
28.        
29.         // Assert
30.         Assert.That(hasTriggeredHighEvent, Is.True);
31.     }
32. }