diff --git a/Source/Editor/Content/Items/AssetItem.cs b/Source/Editor/Content/Items/AssetItem.cs
index 6697ed27c..8ececa278 100644
--- a/Source/Editor/Content/Items/AssetItem.cs
+++ b/Source/Editor/Content/Items/AssetItem.cs
@@ -88,6 +88,15 @@ namespace FlaxEditor.Content
         /// <inheritdoc />
         public override ContentItemType ItemType => ContentItemType.Asset;
 
+        /// <summary>
+        /// Loads the asset.
+        /// </summary>
+        /// <returns>The asset object.</returns>
+        public Asset LoadAsync()
+        {
+            return FlaxEngine.Content.LoadAsync<BinaryAsset>(ID);
+        }
+
         /// <summary>
         /// Determines whether asset is of the specified type (included inheritance checks).
         /// </summary>
diff --git a/Source/Editor/GUI/AssetPicker.cs b/Source/Editor/GUI/AssetPicker.cs
index 41f360195..bfded5380 100644
--- a/Source/Editor/GUI/AssetPicker.cs
+++ b/Source/Editor/GUI/AssetPicker.cs
@@ -206,6 +206,11 @@ namespace FlaxEditor.GUI
         /// </summary>
         public event Action SelectedItemChanged;
 
+        /// <summary>
+        /// The custom callback for assets validation. Cane be used to implement a rule for assets to pick.
+        /// </summary>
+        public Func<ContentItem, bool> CheckValid;
+
         /// <summary>
         /// False if changing selected item is disabled.
         /// </summary>
@@ -215,6 +220,8 @@ namespace FlaxEditor.GUI
         {
             if (_fileExtension != null && !item.Path.EndsWith(_fileExtension))
                 return false;
+            if (CheckValid != null && !CheckValid(item))
+                return false;
             if (_type == ScriptType.Null)
                 return true;
 
diff --git a/Source/Engine/Animations/Graph/AnimGraph.cpp b/Source/Engine/Animations/Graph/AnimGraph.cpp
index 43c9e10b9..3314aecab 100644
--- a/Source/Engine/Animations/Graph/AnimGraph.cpp
+++ b/Source/Engine/Animations/Graph/AnimGraph.cpp
@@ -336,10 +336,6 @@ void AnimGraphExecutor::Update(AnimGraphInstanceData& data, float dt)
                     //value.Orientation.Normalize();
                     targetNodes[i] = value;
                 }
-                else
-                {
-                    int a = 10;
-                }
             }
         }
 
diff --git a/Source/Engine/Content/Upgraders/ModelAssetUpgrader.h b/Source/Engine/Content/Upgraders/ModelAssetUpgrader.h
index eb8b2ca2b..977f27349 100644
--- a/Source/Engine/Content/Upgraders/ModelAssetUpgrader.h
+++ b/Source/Engine/Content/Upgraders/ModelAssetUpgrader.h
@@ -26,10 +26,10 @@ public:
     {
         static const Upgrader upgraders[] =
         {
-            { 24, 25, &Upgrade_With_Repack },
-            { 23, 24, &Upgrade_22OrNewer_To_Newest },
-            { 22, 24, &Upgrade_22OrNewer_To_Newest },
-            { 1, 24, &Upgrade_Old_To_Newest },
+            { 24, 25, &Upgrade_With_Repack }, // [Deprecated on 28.04.2023, expires on 01.01.2024]
+            { 23, 24, &Upgrade_22OrNewer_To_Newest }, // [Deprecated on 28.04.2023, expires on 01.01.2024]
+            { 22, 24, &Upgrade_22OrNewer_To_Newest }, // [Deprecated on 28.04.2023, expires on 01.01.2024]
+            { 1, 24, &Upgrade_Old_To_Newest }, // [Deprecated on 28.04.2023, expires on 01.01.2024]
         };
         setup(upgraders, ARRAY_COUNT(upgraders));
     }
diff --git a/Source/Engine/Serialization/ReadStream.h b/Source/Engine/Serialization/ReadStream.h
index 69e86fa4b..9d3215442 100644
--- a/Source/Engine/Serialization/ReadStream.h
+++ b/Source/Engine/Serialization/ReadStream.h
@@ -193,14 +193,11 @@ public:
         ReadInt32(&count);
         data.Clear();
         data.EnsureCapacity(count);
-        if (count > 0)
+        for (int32 i = 0; i < count; i++)
         {
-            for (int32 i = 0; i < count; i++)
-            {
-                KeyType key;
-                Read(key);
-                Read(data[key]);
-            }
+            KeyType key;
+            Read(key);
+            Read(data[key]);
         }
     }
 
diff --git a/Source/Engine/Serialization/WriteStream.h b/Source/Engine/Serialization/WriteStream.h
index 49573bf8d..92ac211ca 100644
--- a/Source/Engine/Serialization/WriteStream.h
+++ b/Source/Engine/Serialization/WriteStream.h
@@ -199,13 +199,10 @@ public:
     {
         const int32 count = data.Count();
         WriteInt32(count);
-        if (count > 0)
+        for (const auto& e : data)
         {
-            for (const auto& e : data)
-            {
-                Write(e.Key);
-                Write(e.Value);
-            }
+            Write(e.Key);
+            Write(e.Value);
         }
     }