Fix initialization order for the manager objects

Assets/Scripts/Core/GameManager.cs

@@ -5,6 +5,7 @@ using System.Collections.Generic;
 using AppleHills.Core.Interfaces;
 using Core;
 using UI;
+using Bootstrap;
 
 /// <summary>
 /// Singleton manager for global game state and settings. Provides accessors for various gameplay parameters.
@@ -70,10 +71,18 @@ public class GameManager : MonoBehaviour
         InitializeSettings();
         InitializeDeveloperSettings();
         
+        // Register for post-boot initialization
+        BootCompletionService.RegisterInitAction(InitializePostBoot);
+        
         // DontDestroyOnLoad(gameObject);
     }
     
     private void Start()
+    {
+        // PauseMenu subscription moved to InitializePostBoot
+    }
+    
+    private void InitializePostBoot()
     {
         // Find and subscribe to PauseMenu events
         PauseMenu pauseMenu = PauseMenu.Instance;

Assets/Scripts/Core/ItemManager.cs

@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using UnityEngine;
 using Interactions;
+using Bootstrap;
 
 namespace Core
 {
@@ -63,13 +64,21 @@ namespace Core
         void Awake()
         {
             _instance = this;
+            
+            // Register for post-boot initialization
+            BootCompletionService.RegisterInitAction(InitializePostBoot);
         }
 
         void Start()
+        {
+            // SceneManagerService subscription moved to InitializePostBoot
+        }
+        
+        private void InitializePostBoot()
         {
             // Subscribe to scene load completed so we can clear registrations when scenes change
-            // Access Instance directly to ensure the service is initialized and we get the event hookup.
             SceneManagerService.Instance.SceneLoadStarted += OnSceneLoadStarted;
+            Logging.Debug("[ItemManager] Subscribed to SceneManagerService events");
         }
 
         void OnDestroy()

Assets/Scripts/UI/PauseMenu.cs

@@ -3,6 +3,7 @@ using Core;
 using UnityEngine;
 using UnityEngine.SceneManagement;
 using Input;
+using Bootstrap;
 
 namespace UI
 {
@@ -43,10 +44,17 @@ namespace UI
         /// </summary>
         public bool IsPaused => _isPaused;
         
+        private void Awake()
+        {
+            _instance = this;
+            
+            // Register for post-boot initialization
+            BootCompletionService.RegisterInitAction(InitializePostBoot);
+        }
+
         private void Start()
         {
-            // Subscribe to scene loaded events
-            SceneManagerService.Instance.SceneLoadCompleted += SetPauseMenuByLevel;
+            // SceneManagerService subscription moved to InitializePostBoot
             
             // Set initial state based on current scene
             SetPauseMenuByLevel(SceneManager.GetActiveScene().name);
@@ -57,6 +65,13 @@ namespace UI
             #endif
         }
 
+        private void InitializePostBoot()
+        {
+            // Subscribe to scene loaded events
+            SceneManagerService.Instance.SceneLoadCompleted += SetPauseMenuByLevel;
+            Logging.Debug("[PauseMenu] Subscribed to SceneManagerService events");
+        }
+
         private void OnDestroy()
         {
             // Unsubscribe when destroyed