Small fixes

Author: EmandM

com.unity.netcode.gameobjects/Runtime/Core/NetworkObject.cs

@@ -2854,6 +2854,10 @@ internal static void VerifyParentingStatus()
         /// </returns>
         public ushort GetNetworkBehaviourOrderIndex(NetworkBehaviour instance)
         {
+            if (ChildNetworkBehaviours == null)
+            {
+                InitializeChildNetworkBehaviours();
+            }
             return instance.NetworkBehaviourId;
         }
 
@@ -2864,6 +2868,11 @@ public ushort GetNetworkBehaviourOrderIndex(NetworkBehaviour instance)
         /// <returns>The <see cref="NetworkBehaviour"/> at the ordered index value or null if it does not exist.</returns>
         public NetworkBehaviour GetNetworkBehaviourAtOrderIndex(ushort index)
         {
+            if (ChildNetworkBehaviours == null)
+            {
+                InitializeChildNetworkBehaviours();
+            }
+
             if (ChildNetworkBehaviours.TryGetValue(index, out var childBehaviour))
             {
                 return childBehaviour;
@@ -3533,8 +3542,6 @@ internal void SceneChangedUpdate(Scene scene, bool notify = false)
 
         private void Awake()
         {
-            InitializeChildNetworkBehaviours();
-
             SetCachedParent(transform.parent);
             SceneOrigin = gameObject.scene;
         }

com.unity.netcode.gameobjects/Tests/Editor/NetworkObjectTests.cs

@@ -33,17 +33,14 @@ public void NetworkManagerOverrideTest()
         }
 
         [Test]
-        [TestCase(0)]
-        [TestCase(1)]
-        [TestCase(2)]
-        public void GetBehaviourIndexNone(int index)
+        public void GetBehaviourIndexNone()
         {
             var gameObject = new GameObject(nameof(GetBehaviourIndexNone));
             var networkObject = gameObject.AddComponent<NetworkObject>();
 
             LogAssert.Expect(LogType.Error, new Regex(".*out of bounds.*"));
 
-            Assert.That(networkObject.GetNetworkBehaviourAtOrderIndex((ushort)index), Is.Null);
+            Assert.That(networkObject.GetNetworkBehaviourAtOrderIndex(5), Is.Null);
 
             // Cleanup
             Object.DestroyImmediate(gameObject);

com.unity.netcode.gameobjects/Tests/Runtime/TestHelpers/NetcodeIntegrationTest.cs

@@ -2650,6 +2650,11 @@ public static void SimulateOneFrame()
                     {
                         var method = obj.GetType().GetMethod(methodName, BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance);
                         method?.Invoke(obj, new object[] { });
+                        if (obj.ChildNetworkBehaviours == null)
+                        {
+                            obj.InitializeChildNetworkBehaviours();
+                        }
+
                         foreach (var behaviour in obj.ChildNetworkBehaviours)
                         {
                             var behaviourMethod = behaviour.GetType().GetMethod(methodName, BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance);