From 826e21ecc85be03e15c4d2ad2f403ccb4dc2068e Mon Sep 17 00:00:00 2001
From: Shadowghost <Ghost_of_Stone@web.de>
Date: Fri, 27 Feb 2026 13:51:51 +0100
Subject: [PATCH] Fix LinkedAlternativeVersion validation

---
 Emby.Server.Implementations/Library/LibraryManager.cs | 9 +++++++++
 MediaBrowser.Controller/Entities/Folder.cs            | 7 -------
 2 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/Emby.Server.Implementations/Library/LibraryManager.cs b/Emby.Server.Implementations/Library/LibraryManager.cs
index ef3402089b..0ad63ef84a 100644
--- a/Emby.Server.Implementations/Library/LibraryManager.cs
+++ b/Emby.Server.Implementations/Library/LibraryManager.cs
@@ -456,6 +456,15 @@ namespace Emby.Server.Implementations.Library
             {
                 // If deleting an alternate version, re-route references to its primary
                 RerouteLinkedChildReferencesAsync(alternateVideo.Id, alternateVideo.PrimaryVersionId.Value).GetAwaiter().GetResult();
+
+                // Remove deleted alternate from primary's LinkedAlternateVersions
+                if (GetItemById(alternateVideo.PrimaryVersionId.Value) is Video primaryVideo)
+                {
+                    primaryVideo.LinkedAlternateVersions = primaryVideo.LinkedAlternateVersions
+                        .Where(lc => !lc.ItemId.HasValue || !lc.ItemId.Value.Equals(alternateVideo.Id))
+                        .ToArray();
+                    primaryVideo.UpdateToRepositoryAsync(ItemUpdateType.MetadataEdit, CancellationToken.None).GetAwaiter().GetResult();
+                }
             }
 
             var children = item.IsFolder
diff --git a/MediaBrowser.Controller/Entities/Folder.cs b/MediaBrowser.Controller/Entities/Folder.cs
index dce5664672..cc322d0ddd 100644
--- a/MediaBrowser.Controller/Entities/Folder.cs
+++ b/MediaBrowser.Controller/Entities/Folder.cs
@@ -510,13 +510,6 @@ namespace MediaBrowser.Controller.Entities
                         // Skip items that are alternate versions of another video
                         if (item is Video video)
                         {
-                            // Check via PrimaryVersionId
-                            if (video.PrimaryVersionId.HasValue)
-                            {
-                                Logger.LogDebug("Item is an alternate version (via PrimaryVersionId), skipping deletion: {Path}", item.Path ?? item.Name);
-                                continue;
-                            }
-
                             // Check if path is in LocalAlternateVersions of any valid child
                             if (!string.IsNullOrEmpty(item.Path) && alternateVersionPaths.Contains(item.Path))
                             {