From 8293eb26b995a21f88bff60dcf93da8d98080cc0 Mon Sep 17 00:00:00 2001
From: Shadowghost <Ghost_of_Stone@web.de>
Date: Wed, 29 Jul 2026 14:40:49 +0200
Subject: Fix playlist entries being lost on migration and library scans

---
 MediaBrowser.Controller/Entities/Folder.cs | 28 ++++++++++++++++++++++------
 1 file changed, 22 insertions(+), 6 deletions(-)

(limited to 'MediaBrowser.Controller')

diff --git a/MediaBrowser.Controller/Entities/Folder.cs b/MediaBrowser.Controller/Entities/Folder.cs
index b1f7f29bad..f475379cc3 100644
--- a/MediaBrowser.Controller/Entities/Folder.cs
+++ b/MediaBrowser.Controller/Entities/Folder.cs
@@ -43,11 +43,7 @@ namespace MediaBrowser.Controller.Entities
     public class Folder : BaseItem
     {
         private IEnumerable<BaseItem> _children;
-
-        public Folder()
-        {
-            LinkedChildren = Array.Empty<LinkedChild>();
-        }
+        private LinkedChild[] _linkedChildren = [];
 
         public static IUserViewManager UserViewManager { get; set; }
 
@@ -63,7 +59,27 @@ namespace MediaBrowser.Controller.Entities
         /// Gets or sets the linked children.
         /// </summary>
         [JsonIgnore]
-        public LinkedChild[] LinkedChildren { get; set; }
+        public LinkedChild[] LinkedChildren
+        {
+            get => _linkedChildren;
+            set
+            {
+                _linkedChildren = value;
+
+                // Assigning the collection means the caller knows the complete set of links.
+                LinkedChildrenLoaded = true;
+            }
+        }
+
+        /// <summary>
+        /// Gets a value indicating whether <see cref="LinkedChildren"/> holds the stored set of links.
+        /// </summary>
+        /// <remarks>
+        /// An unloaded instance carries an empty array that means "unknown", not "no children" —
+        /// persisting it would delete every link the item has.
+        /// </remarks>
+        [JsonIgnore]
+        public bool LinkedChildrenLoaded { get; private set; }
 
         [JsonIgnore]
         public DateTime? DateLastMediaAdded { get; set; }
-- 
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