diff --git a/js/CanvasView.js b/js/CanvasView.js
index 67d88e5..256f4c4 100644
--- a/js/CanvasView.js
+++ b/js/CanvasView.js
@@ -842,6 +842,7 @@ async function createCanvasWidget(node, widget, app) {
                             delete newLayer.imageId;
                             canvas.layers[selectedLayerIndex] = newLayer;
                             canvas.canvasSelection.updateSelection([newLayer]);
+                            canvas.canvasLayersPanel?.onLayersChanged();
                             // Invalidate processed image cache when layer image changes (matting)
                             canvas.canvasLayers.invalidateProcessedImageCache(newLayer.id);
                             canvas.render();
diff --git a/src/CanvasView.ts b/src/CanvasView.ts
index ae099c2..f933df6 100644
--- a/src/CanvasView.ts
+++ b/src/CanvasView.ts
@@ -1046,6 +1046,7 @@ async function createCanvasWidget(node: ComfyNode, widget: any, app: ComfyApp):
                             
                             canvas.layers[selectedLayerIndex] = newLayer;
                             canvas.canvasSelection.updateSelection([newLayer]);
+                            canvas.canvasLayersPanel?.onLayersChanged();
                             
                             // Invalidate processed image cache when layer image changes (matting)
                             canvas.canvasLayers.invalidateProcessedImageCache(newLayer.id);
diff --git a/tests/test_matting_status_characterization.mjs b/tests/test_matting_status_characterization.mjs
index c385bc6..8f8e68e 100644
--- a/tests/test_matting_status_characterization.mjs
+++ b/tests/test_matting_status_characterization.mjs
@@ -58,3 +58,10 @@ test('CanvasView delegates both model status checks to the shared helper', () =>
   assert.doesNotMatch(canvasViewSource, /const modelCheckUrl =/);
   assert.doesNotMatch(canvasViewSource, /fetch\(['"]\/matting\/check-model/);
 });
+
+test('Matting refreshes the layer panel after replacing a layer object', () => {
+  assert.match(
+    canvasViewSource,
+    /canvas\.layers\[selectedLayerIndex\] = newLayer;\s+canvas\.canvasSelection\.updateSelection\(\[newLayer\]\);\s+canvas\.canvasLayersPanel\?\.onLayersChanged\(\);/,
+  );
+});