Fix missing season Index (#11472)

MediaBrowser.Providers/Manager/MetadataService.cs

@@ -72,7 +72,7 @@ namespace MediaBrowser.Providers.Manager
             }
         }
 
-        public async Task<ItemUpdateType> RefreshMetadata(BaseItem item, MetadataRefreshOptions refreshOptions, CancellationToken cancellationToken)
+        public virtual async Task<ItemUpdateType> RefreshMetadata(BaseItem item, MetadataRefreshOptions refreshOptions, CancellationToken cancellationToken)
         {
             var itemOfType = (TItemType)item;
 

MediaBrowser.Providers/TV/SeriesMetadataService.cs

@@ -8,6 +8,7 @@ using System.Threading;
 using System.Threading.Tasks;
 using MediaBrowser.Controller.Configuration;
 using MediaBrowser.Controller.Dto;
+using MediaBrowser.Controller.Entities;
 using MediaBrowser.Controller.Entities.TV;
 using MediaBrowser.Controller.Library;
 using MediaBrowser.Controller.Providers;
@@ -35,6 +36,25 @@ namespace MediaBrowser.Providers.TV
             _localizationManager = localizationManager;
         }
 
+        public override async Task<ItemUpdateType> RefreshMetadata(BaseItem item, MetadataRefreshOptions refreshOptions, CancellationToken cancellationToken)
+        {
+            if (item is Series series)
+            {
+                var seasons = series.GetRecursiveChildren(i => i is Season).ToList();
+
+                foreach (var season in seasons)
+                {
+                    var hasUpdate = refreshOptions != null && season.BeforeMetadataRefresh(refreshOptions.ReplaceAllMetadata);
+                    if (hasUpdate)
+                    {
+                        await season.UpdateToRepositoryAsync(ItemUpdateType.MetadataEdit, cancellationToken).ConfigureAwait(false);
+                    }
+                }
+            }
+
+            return await base.RefreshMetadata(item, refreshOptions, cancellationToken).ConfigureAwait(false);
+        }
+
         /// <inheritdoc />
         protected override async Task AfterMetadataRefresh(Series item, MetadataRefreshOptions refreshOptions, CancellationToken cancellationToken)
         {