com.unity.netcode.gameobjects@1.5.1

The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/) and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).

Additional documentation and release notes are available at [Multiplayer Documentation](https://docs-multiplayer.unity3d.com).

## [1.5.1] - 2023-06-07

### Added

- Added support for serializing `NativeArray<>` and `NativeList<>` in `FastBufferReader`/`FastBufferWriter`, `BufferSerializer`, `NetworkVariable`, and RPCs. (To use `NativeList<>`, add `UNITY_NETCODE_NATIVE_COLLECTION_SUPPORT` to your Scripting Define Symbols in `Project Settings > Player`) (#2375)
- The location of the automatically-created default network prefab list can now be configured (#2544)
- Added: Message size limits (max single message and max fragmented message) can now be set using NetworkManager.MaximumTransmissionUnitSize and NetworkManager.MaximumFragmentedMessageSize for transports that don't work with the default values (#2530)
- Added `NetworkObject.SpawnWithObservers` property (default is true) that when set to false will spawn a `NetworkObject` with no observers and will not be spawned on any client until `NetworkObject.NetworkShow` is invoked. (#2568)

### Fixed

- Fixed: Fixed a null reference in codegen in some projects (#2581)
- Fixed issue where the `OnClientDisconnected` client identifier was incorrect after a pending client connection was denied. (#2569)
- Fixed warning "Runtime Network Prefabs was not empty at initialization time." being erroneously logged when no runtime network prefabs had been added (#2565)
- Fixed issue where some temporary debug console logging was left in a merged PR. (#2562)
- Fixed the "Generate Default Network Prefabs List" setting not loading correctly and always reverting to being checked. (#2545)
- Fixed issue where users could not use NetworkSceneManager.VerifySceneBeforeLoading to exclude runtime generated scenes from client synchronization. (#2550)
- Fixed missing value on `NetworkListEvent` for `EventType.RemoveAt` events.  (#2542,#2543)
- Fixed issue where parenting a NetworkTransform under a transform with a scale other than Vector3.one would result in incorrect values on non-authoritative instances. (#2538)
- Fixed issue where a server would include scene migrated and then despawned NetworkObjects to a client that was being synchronized. (#2532)
- Fixed the inspector throwing exceptions when attempting to render `NetworkVariable`s of enum types. (#2529)
- Making a `NetworkVariable` with an `INetworkSerializable` type that doesn't meet the `new()` constraint will now create a compile-time error instead of an editor crash (#2528)
- Fixed Multiplayer Tools package installation docs page link on the NetworkManager popup. (#2526)
- Fixed an exception and error logging when two different objects are shown and hidden on the same frame (#2524)
- Fixed a memory leak in `UnityTransport` that occurred if `StartClient` failed. (#2518)
- Fixed issue where a client could throw an exception if abruptly disconnected from a network session with one or more spawned `NetworkObject`(s). (#2510)
- Fixed issue where invalid endpoint addresses were not being detected and returning false from NGO UnityTransport. (#2496)
- Fixed some errors that could occur if a connection is lost and the loss is detected when attempting to write to the socket. (#2495)

## Changed

- Adding network prefabs before NetworkManager initialization is now supported. (#2565)
- Connecting clients being synchronized now switch to the server's active scene before spawning and synchronizing NetworkObjects. (#2532)
- Updated `UnityTransport` dependency on `com.unity.transport` to 1.3.4. (#2533)
- Improved performance of NetworkBehaviour initialization by replacing reflection when initializing NetworkVariables with compile-time code generation, which should help reduce hitching during additive scene loads. (#2522)

Runtime/Core/NetworkBehaviourUpdater.cs

@@ -8,6 +8,8 @@ namespace Unity.Netcode
     /// </summary>
     public class NetworkBehaviourUpdater
     {
+        private NetworkManager m_NetworkManager;
+        private NetworkConnectionManager m_ConnectionManager;
         private HashSet<NetworkObject> m_DirtyNetworkObjects = new HashSet<NetworkObject>();
 
 #if DEVELOPMENT_BUILD || UNITY_EDITOR
@@ -19,7 +21,7 @@ namespace Unity.Netcode
             m_DirtyNetworkObjects.Add(networkObject);
         }
 
-        internal void NetworkBehaviourUpdate(NetworkManager networkManager)
+        internal void NetworkBehaviourUpdate()
         {
 #if DEVELOPMENT_BUILD || UNITY_EDITOR
             m_NetworkBehaviourUpdate.Begin();
@@ -30,7 +32,7 @@ namespace Unity.Netcode
                 // trying to process them, even if they were previously marked as dirty.
                 m_DirtyNetworkObjects.RemoveWhere((sobj) => sobj == null);
 
-                if (networkManager.IsServer)
+                if (m_ConnectionManager.LocalClient.IsServer)
                 {
                     foreach (var dirtyObj in m_DirtyNetworkObjects)
                     {
@@ -39,9 +41,9 @@ namespace Unity.Netcode
                             dirtyObj.ChildNetworkBehaviours[k].PreVariableUpdate();
                         }
 
-                        for (int i = 0; i < networkManager.ConnectedClientsList.Count; i++)
+                        for (int i = 0; i < m_ConnectionManager.ConnectedClientsList.Count; i++)
                         {
-                            var client = networkManager.ConnectedClientsList[i];
+                            var client = m_ConnectionManager.ConnectedClientsList[i];
 
                             if (dirtyObj.IsNetworkVisibleTo(client.ClientId))
                             {
@@ -104,5 +106,26 @@ namespace Unity.Netcode
             }
         }
 
+        internal void Initialize(NetworkManager networkManager)
+        {
+            m_NetworkManager = networkManager;
+            m_ConnectionManager = networkManager.ConnectionManager;
+            m_NetworkManager.NetworkTickSystem.Tick += NetworkBehaviourUpdater_Tick;
+        }
+
+        internal void Shutdown()
+        {
+            m_NetworkManager.NetworkTickSystem.Tick -= NetworkBehaviourUpdater_Tick;
+        }
+
+        // TODO 2023-Q2: Order of operations requires NetworkVariable updates first then showing NetworkObjects
+        private void NetworkBehaviourUpdater_Tick()
+        {
+            // First update NetworkVariables
+            NetworkBehaviourUpdate();
+
+            // Then show any NetworkObjects queued to be made visible/shown
+            m_NetworkManager.SpawnManager.HandleNetworkObjectShow();
+        }
     }
 }