diff --git a/modules/mono/editor/GodotTools/GodotTools/Inspector/ExternalTypeReminder.cs b/modules/mono/editor/GodotTools/GodotTools/Inspector/ExternalTypeReminder.cs
new file mode 100644
index 00000000000..71ca3d61835
--- /dev/null
+++ b/modules/mono/editor/GodotTools/GodotTools/Inspector/ExternalTypeReminder.cs
@@ -0,0 +1,35 @@
+using Godot;
+using GodotTools.Internals;
+
+namespace GodotTools.Inspector;
+
+public partial class ExternalTypeReminder : HBoxContainer
+{
+    public override void _Ready()
+    {
+        SetAnchorsPreset(LayoutPreset.TopWide);
+
+        var iconTexture = GetThemeIcon("NodeInfo", "EditorIcons");
+
+        var icon = new TextureRect()
+        {
+            Texture = iconTexture,
+            ExpandMode = TextureRect.ExpandModeEnum.FitWidthProportional,
+            CustomMinimumSize = iconTexture.GetSize(),
+        };
+
+        icon.SizeFlagsVertical = SizeFlags.ShrinkCenter;
+
+        var label = new Label()
+        {
+            Text = "This inspector inherits an external type. Please build the C# project when the external type changes.".TTR(),
+            AutowrapMode = TextServer.AutowrapMode.WordSmart,
+            CustomMinimumSize = new Vector2(100f, 0f),
+        };
+
+        label.SizeFlagsHorizontal = SizeFlags.Fill | SizeFlags.Expand;
+
+        AddChild(icon);
+        AddChild(label);
+    }
+}
diff --git a/modules/mono/editor/GodotTools/GodotTools/Inspector/InspectorPlugin.cs b/modules/mono/editor/GodotTools/GodotTools/Inspector/InspectorPlugin.cs
index 8aeb19e08b7..074e739b248 100644
--- a/modules/mono/editor/GodotTools/GodotTools/Inspector/InspectorPlugin.cs
+++ b/modules/mono/editor/GodotTools/GodotTools/Inspector/InspectorPlugin.cs
@@ -31,9 +31,9 @@ namespace GodotTools.Inspector
 
                 if (string.IsNullOrEmpty(scriptPath))
                 {
-                    // Generic types used empty paths in older versions of Godot
-                    // so we assume your project is out of sync.
-                    AddCustomControl(new InspectorOutOfSyncWarning());
+                    // Types from an external source (PackageReference or ProjectReference)
+                    // uses empty paths, in such case we do not show out of sync warning.
+                    AddCustomControl(new ExternalTypeReminder());
                     break;
                 }
 
diff --git a/modules/mono/glue/GodotSharp/GodotSharp/Core/Bridge/ScriptManagerBridge.cs b/modules/mono/glue/GodotSharp/GodotSharp/Core/Bridge/ScriptManagerBridge.cs
index 91d49854c73..8201d3f1343 100644
--- a/modules/mono/glue/GodotSharp/GodotSharp/Core/Bridge/ScriptManagerBridge.cs
+++ b/modules/mono/glue/GodotSharp/GodotSharp/Core/Bridge/ScriptManagerBridge.cs
@@ -217,7 +217,6 @@ namespace Godot.Bridge
             // not a global class. But if the script is not a global class it must return an empty
             // outClassName string since it should not have a name.
             string scriptPathStr = Marshaling.ConvertStringToManaged(*scriptPath);
-            Debug.Assert(!string.IsNullOrEmpty(scriptPathStr), "Script path can't be empty.");
 
             if (!_pathTypeBiMap.TryGetScriptType(scriptPathStr, out Type? scriptType))
             {