fix: Stop checking hierarchy changed in playmode

com.unity.netcode.gameobjects/CHANGELOG.md

@@ -6,6 +6,18 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 
 Additional documentation and release notes are available at [Multiplayer Documentation](https://docs-multiplayer.unity3d.com).
 [Unreleased]
+
+### Added
+
+### Fixed
+
+- Fixed issue where the `NetworkManagerHelper` was continuing to check for hierarchy changes when in play mode. (#3027)
+
+### Changed
+
+
+## [1.11.0] - 2024-08-20
+
 ### Added
 
 - Added `NetworkVariable.CheckDirtyState` that is to be used in tandem with collections in order to detect whether the collection or an item within the collection has changed. (#3005)

com.unity.netcode.gameobjects/Editor/NetworkManagerHelper.cs

@@ -61,6 +61,12 @@ private static void EditorApplication_playModeStateChanged(PlayModeStateChange p
                     {
                         s_LastKnownNetworkManagerParents.Clear();
                         ScenesInBuildActiveSceneCheck();
+                        EditorApplication.hierarchyChanged -= EditorApplication_hierarchyChanged;
+                        break;
+                    }
+                case PlayModeStateChange.EnteredEditMode:
+                    {
+                        EditorApplication.hierarchyChanged += EditorApplication_hierarchyChanged;
                         break;
                     }
             }
@@ -110,6 +116,12 @@ private static void ScenesInBuildActiveSceneCheck()
         /// </summary>
         private static void EditorApplication_hierarchyChanged()
         {
+            if (Application.isPlaying)
+            {
+                EditorApplication.hierarchyChanged -= EditorApplication_hierarchyChanged;
+                return;
+            }
+
             var allNetworkManagers = Resources.FindObjectsOfTypeAll<NetworkManager>();
             foreach (var networkManager in allNetworkManagers)
             {