diff --git a/GameServer/Server/Packet/Recv/MarkChest/HandlerUpdateMarkChestCsReq.cs b/GameServer/Server/Packet/Recv/MarkChest/HandlerUpdateMarkChestCsReq.cs
index 9901f26d..f572065e 100644
--- a/GameServer/Server/Packet/Recv/MarkChest/HandlerUpdateMarkChestCsReq.cs
+++ b/GameServer/Server/Packet/Recv/MarkChest/HandlerUpdateMarkChestCsReq.cs
@@ -26,6 +26,14 @@ public class HandlerUpdateMarkChestCsReq : Handler
             });
         }
 
+        foreach (var chestData in (player.SceneData!.MarkedChestData.GetValueOrDefault((int)req.FuncId) ?? []).Where(chestData => markedChestData.All(x =>
+                     !(x.ConfigId == chestData.ConfigId && x.FloorId == chestData.FloorId &&
+                       x.GroupId == chestData.GroupId))))
+        {
+            // Add the existing marked chest data if it is not in the new marked chest data
+            markedChestData.Add(chestData);
+        }
+
         player.SceneData!.MarkedChestData[(int)req.FuncId] = markedChestData;
 
         await connection.SendPacket(new PacketUpdateMarkChestScRsp(req.FuncId, player));