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MediaBrowser.Controller/Entities/Folder.cs

@@ -194,7 +194,7 @@ namespace MediaBrowser.Controller.Entities
         /// </summary>
         /// <param name="item">The item.</param>
         /// <exception cref="InvalidOperationException">Unable to add  + item.Name.</exception>
-        public virtual void AddChild(BaseItem item)
+        public void AddChild(BaseItem item)
         {
             item.SetParent(this);
 

MediaBrowser.Controller/Entities/TV/Season.cs

@@ -265,20 +265,5 @@ namespace MediaBrowser.Controller.Entities.TV
 
             return hasChanges;
         }
-
-        /// <inheritdoc />
-        public override void AddChild(BaseItem item)
-        {
-            if (item is Episode episode)
-            {
-                episode.SeriesPresentationUniqueKey = SeriesPresentationUniqueKey;
-                episode.SeriesId = SeriesId;
-                episode.SeriesName = SeriesName;
-                episode.SeasonId = Id;
-                episode.SeasonName = Name;
-            }
-
-            base.AddChild(item);
-        }
     }
 }

MediaBrowser.Controller/Entities/TV/Series.cs

@@ -499,18 +499,5 @@ namespace MediaBrowser.Controller.Entities.TV
 
             return list;
         }
-
-        /// <inheritdoc />
-        public override void AddChild(BaseItem item)
-        {
-            if (item is IHasSeries typedItem)
-            {
-                typedItem.SeriesId = Id;
-                typedItem.SeriesName = Name;
-                typedItem.SeriesPresentationUniqueKey = PresentationUniqueKey;
-            }
-
-            base.AddChild(item);
-        }
     }
 }

MediaBrowser.Providers/TV/SeriesMetadataService.cs

@@ -241,6 +241,9 @@ namespace MediaBrowser.Providers.TV
                     series.Id + (seasonNumber ?? -1).ToString(CultureInfo.InvariantCulture) + seasonName,
                     typeof(Season)),
                 IsVirtualItem = false,
+                SeriesId = series.Id,
+                SeriesName = series.Name,
+                SeriesPresentationUniqueKey = series.GetPresentationUniqueKey()
             };
 
             series.AddChild(season);