fixes

Assets/Scripts/Manager/AudioManager.cs

@@ -2,7 +2,6 @@ using System;
 using System.Collections;
 using System.Collections.Generic;
 using System.Linq;
-using Unity.VisualScripting;
 using UnityEngine;
 
 public class AudioManager : MonoBehaviour
@@ -11,28 +10,23 @@ public class AudioManager : MonoBehaviour
     public AudioLibraryObject audioLibrary;
 
 
-    private void OnEnable()
+    private void Awake()
     {
-        if (Instance is null)
+        if (Instance != null)
         {
-            Instance = this;
+            Destroy(this);
             // TODO: manager itself should not handle this
             // DontDestroyOnLoad(this);
+            return;
         }
-        else
-        {
-            Destroy(Instance);
         Instance = this;
     }
-    }
-
-    private void OnDisable()
-    {
-        Instance = null;
-    }
 
     public static AudioClip FindAudioClip(string nameOfClip)
     {
+        Debug.Log(nameOfClip);
+        Debug.Log(Instance);
+        Debug.Log(Instance.audioLibrary);
         return Instance.audioLibrary.Clips.First(x => x.name == nameOfClip);
     }
 

Assets/Scripts/Manager/GameManager.cs

@@ -30,8 +30,13 @@ public class GameManager : MonoBehaviour
 
     private void Awake()
     {
-        if (Instance != this)
-            Destroy(Instance);
+        if (Instance != null)
+        {
+            Destroy(gameObject);
+            return;
+
+        }
+
         Instance = this;
         health = startHealth;
     }

Assets/Scripts/Manager/MusicManager.cs

@@ -16,6 +16,12 @@ public class MusicManager : MonoBehaviour
 
     void Awake()
     {
+        if (Instance != null)
+        {
+            Destroy(this);
+            return;
+        }
+        Instance = this;
         sources = new AudioSource[intensities.Length];
     }