Fixed #10539

src/Avalonia.Base/Media/DrawingContext.cs

@@ -132,7 +132,7 @@ namespace Avalonia.Media
             double radiusX = 0, double radiusY = 0,
             BoxShadows boxShadows = default)
         {
-            if (brush == null && !PenIsVisible(pen))
+            if (brush == null && !PenIsVisible(pen) && boxShadows.Count == 0)
                 return;
             if (!MathUtilities.IsZero(radiusX))
             {
@@ -160,7 +160,7 @@ namespace Avalonia.Media
         /// </remarks>
         public void DrawRectangle(IBrush? brush, IPen? pen, RoundedRect rrect, BoxShadows boxShadows = default)
         {
-            if (brush == null && !PenIsVisible(pen))
+            if (brush == null && !PenIsVisible(pen) && boxShadows.Count == 0)
                 return;
             DrawRectangleCore(brush, pen, rrect, boxShadows);
         }

tests/Avalonia.RenderTests/Media/BoxShadowTests.cs

@@ -0,0 +1,51 @@
+using System.Threading.Tasks;
+using Avalonia.Controls;
+using Avalonia.Media;
+using Xunit;
+#pragma warning disable CS0649
+
+#if AVALONIA_SKIA
+namespace Avalonia.Skia.RenderTests;
+
+public class BoxShadowTests : TestBase
+{
+    
+    public BoxShadowTests() : base(@"Media\BoxShadow")
+    {
+    }
+    
+    [Fact]
+    public async Task BoxShadowShouldBeRenderedEvenWithNullBrushAndPen()
+    {
+        var target = new Border
+        {
+            Width = 200,
+            Height = 200,
+            Background = null,
+            Child = new Border()
+            {
+                Background = null,
+                Margin = new Thickness(40),
+                BoxShadow = new BoxShadows(new BoxShadow
+                {
+                    Blur = 0,
+                    Color = Colors.Blue,
+                    OffsetX = 10,
+                    OffsetY = 15,
+                    Spread = 0
+                }),
+                Child = new Border
+                {
+                    Background = Brushes.Red
+                }
+            }
+        };
+        
+        await RenderToFile(target);
+        CompareImages();
+    }
+
+
+}
+
+#endif