Core/Scenes: Delay scenes sent when not in world until adding to map

Port From (https://github.com/TrinityCore/TrinityCore/commit/6d93f0a5f79c5465341a850279466ce36232e72e)

Source/Game/Entities/Object/WorldObject.cs

@@ -718,21 +718,24 @@ namespace Game.Entities
 
             if (flags.ActivePlayer)
             {
-                bool HasSceneInstanceIDs = false;
+                Player player = ToPlayer();
+
+                bool HasSceneInstanceIDs = !player.GetSceneMgr().GetSceneTemplateByInstanceMap().Empty();
                 bool HasRuneState = ToUnit().GetPowerIndex(PowerType.Runes) != (int)PowerType.Max;
 
                 data.WriteBit(HasSceneInstanceIDs);
                 data.WriteBit(HasRuneState);
                 data.FlushBits();
-                //if (HasSceneInstanceIDs)
-                //{
-                //    *data << uint(SceneInstanceIDs.size());
-                //    for (std::size_t i = 0; i < SceneInstanceIDs.size(); ++i)
-                //        *data << uint(SceneInstanceIDs[i]);
-                //}
+
+                if (HasSceneInstanceIDs)
+                {
+                    data.WriteInt32(player.GetSceneMgr().GetSceneTemplateByInstanceMap().Count);
+                    foreach (var pair in player.GetSceneMgr().GetSceneTemplateByInstanceMap())
+                        data.WriteUInt32(pair.Key);
+                }
+
                 if (HasRuneState)
                 {
-                    Player player = ToPlayer();
                     float baseCd = player.GetRuneBaseCooldown();
                     uint maxRunes = (uint)player.GetMaxPower(PowerType.Runes);
 

Source/Game/Entities/Player/Player.cs

@@ -5655,6 +5655,8 @@ namespace Game.Entities
                 else
                     ClearQuestSharingInfo();
             }
+
+            GetSceneMgr().TriggerDelayedScenes();
         }
 
         public void RemoveSocial()

Source/Game/Entities/Player/SceneMgr.cs

@@ -17,6 +17,7 @@
 
 using Framework.Constants;
 using Game.DataStorage;
+using Game.Networking;
 using Game.Networking.Packets;
 using System;
 using System.Collections.Generic;
@@ -28,6 +29,7 @@ namespace Game.Entities
         Player _player;
         Dictionary<uint, SceneTemplate> _scenesByInstance = new();
         uint _standaloneSceneInstanceID;
+        List<ServerPacket> _delayedScenes = new();
         bool _isDebuggingScenes;
 
         public SceneMgr(Player player)
@@ -69,8 +71,12 @@ namespace Game.Entities
             playScene.Location = position;
             playScene.TransportGUID = GetPlayer().GetTransGUID();
             playScene.Encrypted = sceneTemplate.Encrypted;
+            playScene.Write();
 
-            GetPlayer().SendPacket(playScene);
+            if (GetPlayer().IsInWorld)
+                GetPlayer().SendPacket(playScene);
+            else
+                _delayedScenes.Add(playScene);
 
             AddInstanceIdToSceneMap(sceneInstanceID, sceneTemplate);
 
@@ -230,6 +236,14 @@ namespace Game.Entities
             return activeSceneCount;
         }
 
+        public void TriggerDelayedScenes()
+        {
+            foreach (var playScene in _delayedScenes)
+                GetPlayer().SendPacket(playScene);
+
+            _delayedScenes.Clear();
+        }
+
         Player GetPlayer() { return _player; }
 
         void RecreateScene(uint sceneScriptPackageId, SceneFlags playbackflags = SceneFlags.Unk16, Position position = null)