diff --git a/scripts/rewrite-agent-workflow-preview-image-urls.ts b/scripts/rewrite-agent-workflow-preview-image-urls.ts
index f81ff98b4..8599fee2f 100644
--- a/scripts/rewrite-agent-workflow-preview-image-urls.ts
+++ b/scripts/rewrite-agent-workflow-preview-image-urls.ts
@@ -133,8 +133,13 @@ async function main() {
   visitSteps(nextConfig.steps || [], (option) => {
     summary.total += 1;
     const currentPreview = normalizeUrl(option.previewImageUrl);
-    const source = normalizeUrl(option.previewImageSourceUrl) || currentPreview;
-    const optimized = buildOptimizedPreviewUrl(source);
+    const preferredSource = normalizeUrl(option.previewImageSourceUrl);
+    const source = preferredSource || currentPreview;
+    const optimized =
+      buildOptimizedPreviewUrl(source) ||
+      (preferredSource && currentPreview !== preferredSource
+        ? buildOptimizedPreviewUrl(currentPreview)
+        : null);
     if (!currentPreview || !source) {
       summary.skipped += 1;
       return;
@@ -188,4 +193,3 @@ main().catch((error) => {
   console.error(error);
   process.exit(1);
 });
-