Core/GameObjects: Added workaround for elevators having different position for every player

Closes #11504

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

@@ -469,7 +469,12 @@ void Object::BuildMovementUpdate(ByteBuffer* data, uint16 flags) const
     if (flags & UPDATEFLAG_TRANSPORT)
     {
         GameObject const* go = ToGameObject();
-        if (go && go->IsTransport())
+        /** @TODO Use IsTransport() to also handle type 11 (TRANSPORT)
+            Currently grid objects are not updated if there are no nearby players,
+            this causes clients to receive different PathProgress
+            resulting in players seeing the object in a different position
+        */
+        if (go && go->ToTransport())
             *data << uint32(go->GetGOValue()->Transport.PathProgress);
         else
             *data << uint32(getMSTime());