diff --git a/web/hwlab-cloud-web/scripts/r6-architecture-parity.test.ts b/web/hwlab-cloud-web/scripts/r6-architecture-parity.test.ts
index 1a74fe4e..5b69fa5f 100644
--- a/web/hwlab-cloud-web/scripts/r6-architecture-parity.test.ts
+++ b/web/hwlab-cloud-web/scripts/r6-architecture-parity.test.ts
@@ -15,6 +15,7 @@ test("R6 route meta title and chunk recovery match Sub2API navigation pattern",
   assert.equal(resolveDocumentTitle("  "), "平台控制台 - HWLAB Cloud Web");
   assert.equal(isChunkLoadError(new Error("Failed to fetch dynamically imported module")), true);
   assert.equal(isChunkLoadError(new Error("Loading CSS chunk 42 failed")), true);
+  assert.equal(isChunkLoadError(new Error("Unable to preload CSS for /assets/MdtodoView.css")), true);
   assert.equal(isChunkLoadError(new Error("ordinary route guard failure")), false);
 
   const memory = new Map<string, string>();
diff --git a/web/hwlab-cloud-web/src/router/guards.ts b/web/hwlab-cloud-web/src/router/guards.ts
index a12c9da6..8334fd11 100644
--- a/web/hwlab-cloud-web/src/router/guards.ts
+++ b/web/hwlab-cloud-web/src/router/guards.ts
@@ -8,7 +8,7 @@ const CHUNK_RELOAD_WINDOW_MS = 10_000;
 
 export function isChunkLoadError(error: unknown): boolean {
   const message = error instanceof Error ? error.message : String(error ?? "");
-  return /Loading chunk|Loading CSS chunk|Failed to fetch dynamically imported module|Importing a module script failed|dynamically imported module/u.test(message);
+  return /Loading chunk|Loading CSS chunk|Unable to preload CSS|Failed to fetch dynamically imported module|Importing a module script failed|dynamically imported module/u.test(message);
 }
 
 export function shouldReloadForChunkError(now = Date.now(), storage: Pick<Storage, "getItem" | "setItem"> = window.sessionStorage): boolean {