Fix

https://github.com/2dust/v2rayN/issues/6119

v2rayN/ServiceLib/Handler/ConfigHandler.cs

@@ -1296,6 +1296,20 @@ namespace ServiceLib.Handler
                 }
             }
 
+            //Keep the last traffic statistics
+            if (lstOriSub != null)
+            {
+                var lstSub = await AppHandler.Instance.ProfileItems(subid);
+                foreach (var item in lstSub)
+                {
+                    var existItem = lstOriSub?.FirstOrDefault(t => config.UiItem.EnableUpdateSubOnlyRemarksExist ? t.Remarks == item.Remarks : CompareProfileItem(t, item, true));
+                    if (existItem != null)
+                    {
+                        await StatisticsHandler.Instance.CloneServerStatItem(existItem.IndexId, item.IndexId);
+                    }
+                }
+            }
+
             return counter;
         }
 

v2rayN/ServiceLib/Handler/StatisticsHandler.cs

@@ -65,6 +65,25 @@
             }
         }
 
+        public async Task CloneServerStatItem(string indexId, string toIndexId)
+        {
+            if (_lstServerStat == null)
+            {
+                return;
+            }
+
+            var stat = _lstServerStat.FirstOrDefault(t => t.IndexId == indexId);
+            if (stat == null)
+            {
+                return;
+            }
+
+            var toStat = JsonUtils.DeepCopy(stat);
+            toStat.IndexId = toIndexId;
+            await SQLiteHelper.Instance.ReplaceAsync(toStat);
+            _lstServerStat.Add(toStat);
+        }
+
         private async Task InitData()
         {
             await SQLiteHelper.Instance.ExecuteAsync($"delete from ServerStatItem where indexId not in ( select indexId from ProfileItem )");