diff --git a/src/AcDream.App/Rendering/FramebufferResizeController.cs b/src/AcDream.App/Rendering/FramebufferResizeController.cs
index 9b962f79..84759f27 100644
--- a/src/AcDream.App/Rendering/FramebufferResizeController.cs
+++ b/src/AcDream.App/Rendering/FramebufferResizeController.cs
@@ -111,6 +111,13 @@ internal sealed class FramebufferResizeController
         if (width <= 0 || height <= 0)
             return;
 
+        // #387 evidence line (permanent — resize events are rare and this is
+        // the only trace of whether the native event fired at all). Lives here
+        // rather than in GameWindow.OnFramebufferResize because the window
+        // callback is contractually a one-line typed-owner handoff
+        // (GameWindowSlice8BoundaryTests.FramebufferResize_IsOneTypedOwnerHandoff).
+        Console.WriteLine($"window: framebuffer resize event {width}x{height}");
+
         // Frozen order: GL viewport, shared aspect publication, camera, then
         // the optional developer-tools layout reset (unbound since Campaign V
         // slice V11 removed the ImGui frontend). Late binding never replays an
diff --git a/src/AcDream.App/Rendering/GameWindow.cs b/src/AcDream.App/Rendering/GameWindow.cs
index d55788e3..5baab269 100644
--- a/src/AcDream.App/Rendering/GameWindow.cs
+++ b/src/AcDream.App/Rendering/GameWindow.cs
@@ -1625,12 +1625,7 @@ public sealed class GameWindow :
     /// previously off the new viewport snap back to default positions.
     /// </summary>
     private void OnFramebufferResize(Silk.NET.Maths.Vector2D<int> newSize)
-    {
-        // #387 evidence line (permanent — resize events are rare and this is
-        // the only trace of whether the native event fired at all).
-        Console.WriteLine($"window: framebuffer resize event {newSize.X}x{newSize.Y}");
-        _framebufferResize.Resize(newSize);
-    }
+        => _framebufferResize.Resize(newSize);
 
     private void OnClosing() => CompleteShutdown(releaseNativeWindow: false);