Merge 564b6f4237 into 04bb95311b

- avoids error in editor

.github/workflows/RunUnityTests.yml

@@ -16,7 +16,7 @@ jobs:
           - 2021.3.45f1
           - 2022.3.51f1
           - 2023.2.20f1
-          - 6000.0.24f1
+          - 6000.0.25f1
 
     steps:
       - name: Checkout repository

Assets/Mirror/Core/NetworkIdentity.cs

@@ -671,8 +671,25 @@ void OnDestroy()
 
                 // if an identity is still in .spawned, remove it too.
                 // fixes: https://github.com/MirrorNetworking/Mirror/issues/3324
+                //
+                // however, verify that spawned[netId] is this NetworkIdentity
+                // fixes: https://github.com/MirrorNetworking/Mirror/issues/3785
+                // - server: netId=42 walks out of and back into AOI range in same frame
+                // - client frame 1:
+                //     on_destroymsg(42) -> NetworkClient.DestroyObject -> GameObject.Destroy(42) // next frame
+                //     on_spawnmsg(42) -> NetworkClient.SpawnPrefab -> Instantiate(42) -> spawned[42]=new_identity
+                // - client frame 2:
+                //     Unity destroys the old 42
+                //     NetworkIdentity.OnDestroy removes .spawned[42] which is new_identity not old_identity
+                //     new_identity becomes orphaned
+                //
+                // solution: only remove if spawned[netId] is this NetworkIdentity or null
+                if (NetworkClient.spawned.TryGetValue(netId, out NetworkIdentity entry))
+                {
+                    if (entry == this || entry == null)
                         NetworkClient.spawned.Remove(netId);
                 }
+            }
 
             // workaround for cyclid NI<->NB reference causing memory leaks
             // after Destroy. [Credits: BigBoxVR/R.S.]

Assets/Mirror/Core/NetworkManager.cs

@@ -634,31 +634,6 @@ public void StopClient()
             NetworkClient.Disconnect();
         }
 
-        // called when quitting the application by closing the window / pressing
-        // stop in the editor. virtual so that inheriting classes'
-        // OnApplicationQuit() can call base.OnApplicationQuit() too
-        public virtual void OnApplicationQuit()
-        {
-            // stop client first
-            // (we want to send the quit packet to the server instead of waiting
-            //  for a timeout)
-            if (NetworkClient.isConnected)
-            {
-                StopClient();
-                //Debug.Log("OnApplicationQuit: stopped client");
-            }
-
-            // stop server after stopping client (for proper host mode stopping)
-            if (NetworkServer.active)
-            {
-                StopServer();
-                //Debug.Log("OnApplicationQuit: stopped server");
-            }
-
-            // Call ResetStatics to reset statics and singleton
-            ResetStatics();
-        }
-
         /// <summary>Set the frame rate for a headless builds. Override to disable or modify.</summary>
         // useful for dedicated servers.
         // useful for headless benchmark clients.
@@ -772,12 +747,41 @@ public static void ResetStatics()
             singleton = null;
         }
 
-        // virtual so that inheriting classes' OnDestroy() can call base.OnDestroy() too
+        // called when quitting the application by closing the window / pressing
+        // stop in the editor.
+        // use OnDestroy instead of OnApplicationQuit:
+        // fixes: https://github.com/MirrorNetworking/Mirror/issues/2802
         public virtual void OnDestroy()
         {
             //Debug.Log("NetworkManager destroyed");
+
+            // stop client first
+            // (we want to send the quit packet to the server instead of waiting
+            //  for a timeout)
+            if (NetworkClient.isConnected)
+            {
+                StopClient();
+                //Debug.Log("OnApplicationQuit: stopped client");
             }
 
+            // stop server after stopping client (for proper host mode stopping)
+            if (NetworkServer.active)
+            {
+                StopServer();
+                //Debug.Log("OnApplicationQuit: stopped server");
+            }
+
+            // Call ResetStatics to reset statics and singleton
+            ResetStatics();
+        }
+
+        // [Obsolete] in case someone is inheriting it.
+        // don't use this anymore.
+        // fixes: https://github.com/MirrorNetworking/Mirror/issues/2802
+        // DEPRECATED 2024-10-29
+        [Obsolete("Override OnDestroy instead of OnApplicationQuit.")]
+        public virtual void OnApplicationQuit() {}
+
         /// <summary>The name of the current network scene.</summary>
         // set by NetworkManager when changing the scene.
         // new clients will automatically load this scene.

Assets/Mirror/Core/NetworkReaderExtensions.cs

@@ -313,8 +313,6 @@ public static List<T> ReadList<T>(this NetworkReader reader)
         // structs may have .Set<T> members which weaver needs to be able to
         // fully serialize for NetworkMessages etc.
         // note that Weaver/Readers/GenerateReader() handles this manually.
-        // TODO writer not found. need to adjust weaver first. see tests.
-        /*
         public static HashSet<T> ReadHashSet<T>(this NetworkReader reader)
         {
             // we offset count by '1' to easily support null without writing another byte.
@@ -334,7 +332,6 @@ public static HashSet<T> ReadHashSet<T>(this NetworkReader reader)
             }
             return result;
         }
-        */
 
         public static T[] ReadArray<T>(this NetworkReader reader)
         {

Assets/Mirror/Core/NetworkServer.cs

@@ -1266,6 +1266,11 @@ public static void SetClientReady(NetworkConnectionToClient conn)
         {
             // Debug.Log($"SetClientReadyInternal for conn:{conn}");
 
+            // only if not already ready yet.
+            // prevents clients spamming ReadyMessage to force observer rebuilds.
+            // fixes: https://github.com/MirrorNetworking/Mirror/issues/2623
+            if (conn.isReady) return;
+
             // set ready
             conn.isReady = true;
 

Assets/Mirror/Core/NetworkWriterExtensions.cs

@@ -365,28 +365,25 @@ public static void WriteList<T>(this NetworkWriter writer, List<T> list)
         // structs may have .Set<T> members which weaver needs to be able to
         // fully serialize for NetworkMessages etc.
         // note that Weaver/Writers/GenerateWriter() handles this manually.
-        // TODO writer not found. need to adjust weaver first. see tests.
+        public static void WriteHashSet<T>(this NetworkWriter writer, HashSet<T> hashSet)
-        // /*
+        {
-        // public static void WriteHashSet<T>(this NetworkWriter writer, HashSet<T> hashSet)
+            // we offset count by '1' to easily support null without writing another byte.
-        // {
+            // encoding null as '0' instead of '-1' also allows for better compression
-        //     // we offset count by '1' to easily support null without writing another byte.
+            // (ushort vs. short / varuint vs. varint) etc.
-        //     // encoding null as '0' instead of '-1' also allows for better compression
+            if (hashSet is null)
-        //     // (ushort vs. short / varuint vs. varint) etc.
+            {
-        //     if (hashSet is null)
+                // most sizes are small, write size as VarUInt!
-        //     {
+                Compression.CompressVarUInt(writer, 0u);
-        //         // most sizes are small, write size as VarUInt!
+                //writer.WriteUInt(0);
-        //         Compression.CompressVarUInt(writer, 0u);
+                return;
-        //         //writer.WriteUInt(0);
+            }
-        //         return;
+
-        //     }
+            // most sizes are small, write size as VarUInt!
-        //
+            Compression.CompressVarUInt(writer, checked((uint)hashSet.Count) + 1u);
-        //     // most sizes are small, write size as VarUInt!
+            //writer.WriteUInt(checked((uint)hashSet.Count) + 1u);
-        //     Compression.CompressVarUInt(writer, checked((uint)hashSet.Count) + 1u);
+            foreach (T item in hashSet)
-        //     //writer.WriteUInt(checked((uint)hashSet.Count) + 1u);
+                writer.Write(item);
-        //     foreach (T item in hashSet)
+        }
-        //         writer.Write(item);
-        // }
-        // */
 
         public static void WriteArray<T>(this NetworkWriter writer, T[] array)
         {

Assets/Mirror/Core/Tools/Extensions.cs

@@ -114,6 +114,18 @@ public static void SetPositionAndRotation(this Transform transform, Vector3 posi
             transform.position = position;
             transform.rotation = rotation;
         }
+
+        public static void GetLocalPositionAndRotation(this Transform transform, out Vector3 position, out Quaternion rotation)
+        {
+            position = transform.localPosition;
+            rotation = transform.localRotation;
+        }
+
+        public static void SetLocalPositionAndRotation(this Transform transform, Vector3 position, Quaternion rotation)
+        {
+            transform.localPosition = position;
+            transform.localRotation = rotation;
+        }
 #endif
 
         // IPEndPoint address only to pretty string.

Assets/Mirror/Core/Transport.cs

@@ -196,8 +196,15 @@ public virtual void ServerLateUpdate() {}
         /// <summary>Shut down the transport, both as client and server</summary>
         public abstract void Shutdown();
 
-        /// <summary>Called by Unity when quitting. Inheriting Transports should call base for proper Shutdown.</summary>
+        // [Obsolete] in case someone is inheriting it.
-        public virtual void OnApplicationQuit()
+        // don't use this anymore.
+        // fixes: https://github.com/MirrorNetworking/Mirror/issues/2802
+        // DEPRECATED 2024-10-29
+        [Obsolete("Override OnDestroy instead of OnApplicationQuit.")]
+        public virtual void OnApplicationQuit() {}
+
+        // fixes: https://github.com/MirrorNetworking/Mirror/issues/2802
+        public virtual void OnDestroy()
         {
             // stop transport (e.g. to shut down threads)
             // (when pressing Stop in the Editor, Unity keeps threads alive

Assets/Mirror/Editor/NetworkScenePostProcess.cs

@@ -55,19 +55,28 @@ public static void OnPostProcessScene()
                     else
                     {
                         // there are two cases where sceneId == 0:
-                        // * if we have a prefab open in the prefab scene
+                        // if we have a prefab open in the prefab scene
-                        // * if an unopened scene needs resaving
-                        // show a proper error message in both cases so the user
-                        // knows what to do.
                         string path = identity.gameObject.scene.path;
                         if (string.IsNullOrWhiteSpace(path))
+                        {
+                            // pressing play while in prefab edit mode used to freeze/crash Unity 2019.
+                            // this seems fine now so we don't need to stop the editor anymore.
+#if UNITY_2020_3_OR_NEWER
+                            Debug.LogWarning($"{identity.name} was open in Prefab Edit Mode while launching with Mirror. If this causes issues, please let us know.");
+#else
                             Debug.LogError($"{identity.name} is currently open in Prefab Edit Mode. Please open the actual scene before launching Mirror.");
-                        else
-                            Debug.LogError($"Scene {path} needs to be opened and resaved, because the scene object {identity.name} has no valid sceneId yet.");
-
-                        // either way we shouldn't continue. nothing good will
-                        // happen when trying to launch with invalid sceneIds.
                             EditorApplication.isPlaying = false;
+#endif
+                        }
+                        // if an unopened scene needs resaving
+                        else
+                        {
+
+                            // nothing good will happen when trying to launch with invalid sceneIds.
+                            // show an error and stop playing immediately.
+                            Debug.LogError($"Scene {path} needs to be opened and resaved, because the scene object {identity.name} has no valid sceneId yet.");
+                            EditorApplication.isPlaying = false;
+                        }
                     }
                 }
             }

Assets/Mirror/Editor/Weaver/Readers.cs

@@ -125,6 +125,13 @@ MethodReference GenerateReader(TypeReference variableReference, ref bool Weaving
 
                 return GenerateReadCollection(variableReference, elementType, nameof(NetworkReaderExtensions.ReadList), ref WeavingFailed);
             }
+            else if (variableDefinition.Is(typeof(HashSet<>)))
+            {
+                GenericInstanceType genericInstance = (GenericInstanceType)variableReference;
+                TypeReference elementType = genericInstance.GenericArguments[0];
+
+                return GenerateReadCollection(variableReference, elementType, nameof(NetworkReaderExtensions.ReadHashSet), ref WeavingFailed);
+            }
             // handle both NetworkBehaviour and inheritors.
             // fixes: https://github.com/MirrorNetworking/Mirror/issues/2939
             else if (variableReference.IsDerivedFrom<NetworkBehaviour>() || variableReference.Is<NetworkBehaviour>())

Assets/Mirror/Editor/Weaver/Writers.cs

@@ -126,6 +126,13 @@ MethodReference GenerateWriter(TypeReference variableReference, ref bool Weaving
 
                 return GenerateCollectionWriter(variableReference, elementType, nameof(NetworkWriterExtensions.WriteList), ref WeavingFailed);
             }
+            if (variableReference.Is(typeof(HashSet<>)))
+            {
+                GenericInstanceType genericInstance = (GenericInstanceType)variableReference;
+                TypeReference elementType = genericInstance.GenericArguments[0];
+
+                return GenerateCollectionWriter(variableReference, elementType, nameof(NetworkWriterExtensions.WriteHashSet), ref WeavingFailed);
+            }
 
             // handle both NetworkBehaviour and inheritors.
             // fixes: https://github.com/MirrorNetworking/Mirror/issues/2939

Assets/Mirror/Examples/AutoLANClientController/Scripts/AutoLANNetworkManager.cs

@@ -62,15 +62,6 @@ public override void LateUpdate()
             base.LateUpdate();
         }
 
-        /// <summary>
-        /// Runs on both Server and Client
-        /// </summary>
-        public override void OnDestroy()
-        {
-            base.OnDestroy();
-            //UnityEngine.Debug.Log("OnDestroy");
-        }
-
 #endregion
 
         #region Start & Stop
@@ -87,10 +78,10 @@ public override void ConfigureHeadlessFrameRate()
         /// <summary>
         /// called when quitting the application by closing the window / pressing stop in the editor
         /// </summary>
-        public override void OnApplicationQuit()
+        public override void OnDestroy()
         {
-            base.OnApplicationQuit();
+            base.OnDestroy();
-            //UnityEngine.Debug.Log("OnApplicationQuit");
+            //UnityEngine.Debug.Log("OnDestroy");
         }
 
         #endregion

Assets/Mirror/Examples/Benchmark/Prefabs/Monster.prefab

@@ -148,5 +148,5 @@ MonoBehaviour:
   syncMode: 0
   syncInterval: 0.1
   speed: 1
-  movementProbability: 0.5
+  movementProbability: 0.1
   movementDistance: 20

Assets/Mirror/Examples/Benchmark/Scripts/MonsterMovement.cs

@@ -5,7 +5,13 @@ namespace Mirror.Examples.Benchmark
     public class MonsterMovement : NetworkBehaviour
     {
         public float speed = 1;
-        public float movementProbability = 0.5f;
+
+        // movement probability:
+        // 0.5 is too high, monsters are moving almost all the time.
+        // only-sync-on-change shows no difference with 0.5 at all.
+        // in other words: broken change detection would be too easy to miss!
+        [Header("Note: use 0.1 to test change detection, 0.5 is too high!")]
+        public float movementProbability = 0.1f;
         public float movementDistance = 20;
 
         bool moving;

Assets/Mirror/Examples/PlayerTest/PlayerRBReliable.prefab

@@ -1,5 +1,111 @@
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+  - component: {fileID: 4760233786622638652}
+  - component: {fileID: 2239866139065920034}
+  m_Layer: 0
+  m_Name: PlayerName
+  m_TagString: Untagged
+  m_Icon: {fileID: 0}
+  m_NavMeshLayer: 0
+  m_StaticEditorFlags: 0
+  m_IsActive: 1
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+  m_PrefabAsset: {fileID: 0}
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+  m_LocalPosition: {x: 0, y: 1.4999999, z: 0}
+  m_LocalScale: {x: 0.1, y: 0.1, z: 0.1}
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+  m_Father: {fileID: 5650773562400175449}
+  m_RootOrder: 1
+  m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
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+  m_ReflectionProbeUsage: 1
+  m_RayTracingMode: 2
+  m_RenderingLayerMask: 1
+  m_RendererPriority: 0
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+  m_ProbeAnchor: {fileID: 0}
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+  m_SortingLayer: 0
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+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 2505838817581327622}
+  m_Text: RB Reliable
+  m_OffsetZ: 0
+  m_CharacterSize: 0.5
+  m_LineSpacing: 1
+  m_Anchor: 4
+  m_Alignment: 1
+  m_TabSize: 4
+  m_FontSize: 100
+  m_FontStyle: 0
+  m_RichText: 1
+  m_Font: {fileID: 10102, guid: 0000000000000000e000000000000000, type: 0}
+  m_Color:
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+    rgba: 4294967040
+--- !u!114 &2239866139065920034
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+  m_Script: {fileID: 11500000, guid: afa2d590c474413d9fc183551385ed85, type: 3}
+  m_Name: 
+  m_EditorClassIdentifier: 
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@@ -194,6 +300,7 @@ Transform:
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   m_Children:
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+  - {fileID: 8070823805368028938}
   m_Father: {fileID: 0}
   m_RootOrder: 0
   m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}

Assets/Mirror/Examples/PlayerTest/PlayerRBUnreliable.prefab

@@ -1,5 +1,111 @@
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+  - component: {fileID: 4630973873820678624}
+  m_Layer: 0
+  m_Name: PlayerName
+  m_TagString: Untagged
+  m_Icon: {fileID: 0}
+  m_NavMeshLayer: 0
+  m_StaticEditorFlags: 0
+  m_IsActive: 1
+--- !u!4 &4129545300081926521
+Transform:
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+  m_CorrespondingSourceObject: {fileID: 0}
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+  m_PrefabAsset: {fileID: 0}
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+  m_LocalPosition: {x: 0, y: 1.4999999, z: 0}
+  m_LocalScale: {x: 0.1, y: 0.1, z: 0.1}
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+  m_Father: {fileID: 6814142693731383418}
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+  m_RendererPriority: 0
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+  m_ProbeAnchor: {fileID: 0}
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+  m_ScaleInLightmap: 1
+  m_ReceiveGI: 1
+  m_PreserveUVs: 0
+  m_IgnoreNormalsForChartDetection: 0
+  m_ImportantGI: 0
+  m_StitchLightmapSeams: 1
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+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 1900176203039934355}
+  m_Text: RB Unreliable
+  m_OffsetZ: 0
+  m_CharacterSize: 0.5
+  m_LineSpacing: 1
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+  m_Alignment: 1
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+  m_Font: {fileID: 10102, guid: 0000000000000000e000000000000000, type: 0}
+  m_Color:
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+    rgba: 4278255615
+--- !u!114 &4630973873820678624
+MonoBehaviour:
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+  m_PrefabInstance: {fileID: 0}
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+  m_Script: {fileID: 11500000, guid: afa2d590c474413d9fc183551385ed85, type: 3}
+  m_Name: 
+  m_EditorClassIdentifier: 
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@@ -194,6 +300,7 @@ Transform:
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+  - {fileID: 4129545300081926521}
   m_Father: {fileID: 0}
   m_RootOrder: 0
   m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}

Assets/Mirror/Examples/PlayerTest/PlayerReliable.prefab

@@ -79,6 +79,112 @@ MeshRenderer:
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   m_SortingLayer: 0
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+  m_Name: PlayerName
+  m_TagString: Untagged
+  m_Icon: {fileID: 0}
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+  m_PrefabInstance: {fileID: 0}
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+  m_GameObject: {fileID: 5366675989284536270}
+  m_Text: Reliable
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+  m_CharacterSize: 0.5
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Assets/Mirror/Examples/PlayerTest/PlayerTestNetMan.cs

@@ -71,14 +71,6 @@ public override void ConfigureHeadlessFrameRate()
             base.ConfigureHeadlessFrameRate();
         }
 
-        /// <summary>
-        /// called when quitting the application by closing the window / pressing stop in the editor
-        /// </summary>
-        public override void OnApplicationQuit()
-        {
-            base.OnApplicationQuit();
-        }
-
         #endregion
 
         #region Scene Management

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+  m_Name: 
+  m_EditorClassIdentifier: 
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@@ -195,6 +301,7 @@ Transform:
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   m_Children:
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+  - {fileID: 8679949096303753939}
   m_Father: {fileID: 0}
   m_RootOrder: 0
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Assets/Mirror/Examples/PlayerTest/TankReliable.prefab

@@ -38,6 +38,7 @@ Transform:
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+  - {fileID: 1245118046271587945}
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     _turnSpeed: 0
     _animVelocity: 0
@@ -328,6 +328,112 @@ MonoBehaviour:
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       value: BasePrefab
       objectReference: {fileID: 0}
+    - target: {fileID: 3638700596990361445, guid: dad07e68d3659e6439279d0d4110cf4c,
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Assets/Mirror/Examples/PlayerTest/TankUnreliable.prefab

@@ -38,6 +38,7 @@ Transform:
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@@ -328,6 +328,112 @@ MonoBehaviour:
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   rotationSensitivity: 0.01
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Assets/Mirror/Examples/_Common/RobotKyle/Materials/Robot_Color.mat

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   m_PrefabAsset: {fileID: 0}
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         m_Scale: {x: 1, y: 1}
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+    crunchedCompression: 0
+    allowsAlphaSplitting: 0
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+    androidETC2FallbackOverride: 0
+    forceMaximumCompressionQuality_BC6H_BC7: 0
+  - serializedVersion: 3
+    buildTarget: Standalone
+    maxTextureSize: 1024
+    resizeAlgorithm: 0
+    textureFormat: -1
+    textureCompression: 1
+    compressionQuality: 50
+    crunchedCompression: 0
+    allowsAlphaSplitting: 0
+    overridden: 0
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+  userData: 
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Assets/Mirror/Examples/_Common/RobotKyle/Textures/Robot_Color.png.meta

@@ -1,45 +0,0 @@
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-  spritePackingTag: 
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Assets/Mirror/Examples/_Common/RobotKyle/Textures/Robot_Normal.jpeg.meta

@@ -0,0 +1,104 @@
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Assets/Mirror/Examples/_Common/Scripts/PlayerCamera.cs

@@ -19,11 +19,6 @@ void Awake()
             mainCam = Camera.main;
         }
 
-        void OnDisable()
-        {
-            //Debug.Log("PlayerCamera.OnDisable");
-        }
-
         public override void OnStartLocalPlayer()
         {
             if (mainCam != null)
@@ -38,16 +33,46 @@ public override void OnStartLocalPlayer()
                 Debug.LogWarning("PlayerCamera: Could not find a camera in scene with 'MainCamera' tag.");
         }
 
+        void OnApplicationQuit()
+        {
+            //Debug.Log("PlayerCamera.OnApplicationQuit");
+            ReleaseCamera();
+        }
+
         public override void OnStopLocalPlayer()
+        {
+            //Debug.Log("PlayerCamera.OnStopLocalPlayer");
+            ReleaseCamera();
+        }
+
+        void OnDisable()
+        {
+            //Debug.Log("PlayerCamera.OnDisable");
+            ReleaseCamera();
+        }
+
+        void OnDestroy()
+        {
+            //Debug.Log("PlayerCamera.OnDestroy");
+            ReleaseCamera();
+        }
+
+        void ReleaseCamera()
         {
             if (mainCam != null && mainCam.transform.parent == transform)
             {
+                //Debug.Log("PlayerCamera.ReleaseCamera");
+
                 mainCam.transform.SetParent(null);
-                SceneManager.MoveGameObjectToScene(mainCam.gameObject, SceneManager.GetActiveScene());
                 mainCam.orthographic = true;
                 mainCam.orthographicSize = 15f;
                 mainCam.transform.localPosition = new Vector3(0f, 70f, 0f);
                 mainCam.transform.localEulerAngles = new Vector3(90f, 0f, 0f);
+
+                if (mainCam.gameObject.scene != SceneManager.GetActiveScene())
+                    SceneManager.MoveGameObjectToScene(mainCam.gameObject, SceneManager.GetActiveScene());
+
+                mainCam = null;
             }
         }
     }

Assets/Mirror/Tests/Editor/NetworkReaderWriter/NetworkWriterTest.cs

@@ -1341,7 +1341,15 @@ public void TestNullList()
             Assert.That(readList, Is.Null);
         }
 
-        [Test, Ignore("TODO")]
+        // writer.Write<T> for HashSet only works if it's actually used by weaver somewhere.
+        // so for TestHashSet() to pass, we need to pretend using a HashSet<int> somewhere.
+        class HashSetNetworkBehaviour : NetworkBehaviour
+        {
+            [Command]
+            public void CmdHashSet(HashSet<int> hashSet) {}
+        }
+
+        [Test] // requires HashSetNetworkBehaviour to exits!
         public void TestHashSet()
         {
             HashSet<int> original = new HashSet<int>() { 1, 2, 3, 4, 5 };
@@ -1353,7 +1361,7 @@ public void TestHashSet()
             Assert.That(readHashSet, Is.EqualTo(original));
         }
 
-        [Test, Ignore("TODO")]
+        [Test] // requires HashSetNetworkBehaviour to exits!
         public void TestNullHashSet()
         {
             NetworkWriter writer = new NetworkWriter();

Assets/Mirror/Transports/Edgegap/EdgegapLobby/EdgegapLobbyKcpTransport.cs

@@ -323,7 +323,7 @@ public void SetServerLobbyParams(LobbyCreateRequest request)
             _request = request;
         }
 
-        private void OnDestroy()
+        public override void OnDestroy()
         {
             // attempt to clean up lobbies, if active
             if (NetworkServer.active)
@@ -340,6 +340,8 @@ private void OnDestroy()
                 // sorry. this can go once the lobby service can timeout lobbies itself
                 Thread.Sleep(300);
             }
+
+            base.OnDestroy();
         }
     }
 }

Assets/Mirror/Transports/KCP/KcpTransport.cs

@@ -116,7 +116,7 @@ protected virtual void Awake()
                 () => OnClientConnected.Invoke(),
                 (message, channel) => OnClientDataReceived.Invoke(message, FromKcpChannel(channel)),
                 () => OnClientDisconnected?.Invoke(), // may be null in StopHost(): https://github.com/MirrorNetworking/Mirror/issues/3708
-                (error, reason) => OnClientError.Invoke(ToTransportError(error), reason),
+                (error, reason) => OnClientError?.Invoke(ToTransportError(error), reason), // may be null during shutdown: https://github.com/MirrorNetworking/Mirror/issues/3876
                 config
             );
 

Assets/Mirror/Transports/Threaded/ThreadedTransport.cs

@@ -197,11 +197,10 @@ void EnsureThread()
             Debug.Log($"ThreadedTransport: started worker thread!");
         }
 
-        protected virtual void OnDestroy()
+        public override void OnDestroy()
         {
             // stop thread fully
-            Shutdown();
+            base.OnDestroy();
-
             // TODO recycle writers.
         }
 

Assets/ScriptTemplates/50-Mirror__Network Manager-NewNetworkManager.cs.txt

@@ -68,14 +68,6 @@ public class #SCRIPTNAME# : NetworkManager
         base.ConfigureHeadlessFrameRate();
     }
 
-    /// <summary>
-    /// called when quitting the application by closing the window / pressing stop in the editor
-    /// </summary>
-    public override void OnApplicationQuit()
-    {
-        base.OnApplicationQuit();
-    }
-
     #endregion
 
     #region Scene Management

Assets/ScriptTemplates/51-Mirror__Network Manager With Actions-NewNetworkManagerWithActions.cs.txt

@@ -15,8 +15,6 @@ public class #SCRIPTNAME# : NetworkManager
     public event Action OnStartAction;
     public event Action OnDestroyAction;
 
-    public event Action OnApplicationQuitAction;
-
     public event Action<string> ServerChangeSceneAction;
     public event Action<string> OnServerChangeSceneAction;
     public event Action<string> OnServerSceneChangedAction;
@@ -117,15 +115,6 @@ public class #SCRIPTNAME# : NetworkManager
         base.ConfigureHeadlessFrameRate();
     }
 
-    /// <summary>
-    /// called when quitting the application by closing the window / pressing stop in the editor
-    /// </summary>
-    public override void OnApplicationQuit()
-    {
-        OnApplicationQuitAction?.Invoke();
-        base.OnApplicationQuit();
-    }
-
     #endregion
 
     #region Scene Management