Ensure messages are deferred until after the client is fully connected and synchronized

Author: EmandM

com.unity.netcode.gameobjects/Runtime/Messaging/Messages/DestroyObjectMessage.cs

@@ -112,7 +112,7 @@ public bool Deserialize(FastBufferReader reader, ref NetworkContext context, int
             }
 
             // Client-Server mode we always defer where in distributed authority mode we only defer if it is not a targeted destroy
-            if (!networkManager.DistributedAuthorityMode || (networkManager.DistributedAuthorityMode && !IsTargetedDestroy))
+            if (!networkManager.DistributedAuthorityMode || !networkManager.IsConnectedClient || (networkManager.DistributedAuthorityMode && !IsTargetedDestroy))
             {
                 networkManager.DeferredMessageManager.DeferMessage(IDeferredNetworkMessageManager.TriggerType.OnSpawn, NetworkObjectId, reader, ref context, k_Name);
             }

com.unity.netcode.gameobjects/Runtime/SceneManagement/NetworkSceneManager.cs

@@ -657,6 +657,12 @@ internal bool ShouldDeferCreateObject()
             {
                 return false;
             }
+
+            if (!NetworkManager.IsConnectedClient)
+            {
+                return true;
+            }
+
             var synchronizeEventDetected = false;
             var loadingEventDetected = false;
             foreach (var entry in SceneEventDataStore)