Core/Entities: add extra use of UPDATETYPE_CREATE_OBJECT2 (#20955)

(cherry picked from commit 51c4196acf)

src/server/game/Entities/Object/Object.cpp

@@ -67,6 +67,7 @@ Object::Object() : m_values(this)
     m_updateFlag.Clear();
 
     m_inWorld           = false;
+    m_isNewObject       = false;
     m_objectUpdated     = false;
 }
 

src/server/game/Entities/Object/Object.h

@@ -168,6 +168,7 @@ class TC_GAME_API Object
 
         virtual bool hasQuest(uint32 /* quest_id */) const { return false; }
         virtual bool hasInvolvedQuest(uint32 /* quest_id */) const { return false; }
+        void SetIsNewObject(bool enable) { m_isNewObject = enable; }
         virtual void BuildUpdate(UpdateDataMapType&) { }
         void BuildFieldsUpdate(Player*, UpdateDataMapType &) const;
 
@@ -346,6 +347,7 @@ class TC_GAME_API Object
     private:
         ObjectGuid m_guid;
         bool m_inWorld;
+        bool m_isNewObject;
 
         Object(Object const& right) = delete;
         Object& operator=(Object const& right) = delete;

src/server/game/Maps/Map.cpp

@@ -728,7 +728,9 @@ bool Map::AddToMap(T* obj)
 
     //something, such as vehicle, needs to be update immediately
     //also, trigger needs to cast spell, if not update, cannot see visual
+    obj->SetIsNewObject(true);
     obj->UpdateObjectVisibilityOnCreate();
+    obj->SetIsNewObject(false);
     return true;
 }