fix - prevent marking dynamically spawned objects as in-scene

This fix just ignores any spawned objects when setting any just loaded InScenePlaced objects while running in the editor.

Author: NoelStephensUnity

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

@@ -21,6 +21,11 @@ public void OnProcessScene(Scene scene, BuildReport report)
         {
             foreach (var networkObject in FindObjects.FromSceneByType<NetworkObject>(scene, true))
             {
+                // Exclude any already spawned objects found since this 
+                if (networkObject.IsSpawned)
+                {
+                    continue;
+                }
                 networkObject.InScenePlaced = true;
             }
         }