diff --git a/src/proxy/captcha-happy.test.ts b/src/proxy/captcha-happy.test.ts
index be615d9..a5acc4a 100644
--- a/src/proxy/captcha-happy.test.ts
+++ b/src/proxy/captcha-happy.test.ts
@@ -251,3 +251,25 @@ describe("alias lifecycle (install/remove descriptor contract)", () => {
     expect(Object.getOwnPropertyDescriptor(g, "setTimeout")?.get).toBeUndefined();
   });
 });
+
+describe("browser globals the guest SDK dereferences bare", () => {
+  test("requestAnimationFrame/cancelAnimationFrame resolve during a solve", () => {
+    // Bun has no native rAF. While these sat in HOST_CRITICAL_GLOBALS the
+    // alias pass skipped them, so the FeiLin bundle's 9 bare
+    // `requestAnimationFrame` references (only one `typeof`-guarded) were
+    // unresolvable — the same silent fingerprint degradation `print` caused,
+    // visible only as a lower solve rate.
+    const g: Record<string, unknown> = {};
+    const w: Record<string, unknown> = {
+      requestAnimationFrame: (cb: () => void) => 1,
+      cancelAnimationFrame: () => {},
+    };
+    installGlobalWindowAlias(g, w, 15);
+    try {
+      expect(typeof g.requestAnimationFrame).toBe("function");
+      expect(typeof g.cancelAnimationFrame).toBe("function");
+    } finally {
+      removeGlobalWindowAlias(g, w);
+    }
+  });
+});
diff --git a/src/proxy/captcha-happy.ts b/src/proxy/captcha-happy.ts
index c82f300..926fcce 100644
--- a/src/proxy/captcha-happy.ts
+++ b/src/proxy/captcha-happy.ts
@@ -630,7 +630,13 @@ function installNativeToString(w) {
         try {
           const v = desc.get.call(obj);
           if (typeof v === "function") mask(v);
-        } catch (_) {}
+          // Probing a getter can hand back an already-rejected promise (WHATWG
+          // stream `closed`/`ready` reject when the receiver is the prototype
+          // rather than an instance). Nobody awaits these, so without a sink
+          // each probe surfaced as an unhandledRejection on every solve —
+          // noise that buried real diagnostics.
+          else if (v && typeof v.then === "function") v.catch(() => {});
+        } catch {}
       }
       if (depth < 3) {
         try {
@@ -1774,7 +1780,12 @@ async function createDom(region, prefix) {
 const HOST_CRITICAL_GLOBALS = new Set([
   "process", "Bun", "console", "performance", "crypto", "fetch",
   "queueMicrotask", "structuredClone", "TextEncoder", "TextDecoder",
-  "requestAnimationFrame", "cancelAnimationFrame",
+  // NOTE: requestAnimationFrame/cancelAnimationFrame were removed from this
+  // list (2026-09-06). Bun has no native rAF, so skipping the alias left a
+  // bare `requestAnimationFrame` in the FeiLin bundle unresolvable (9 call
+  // sites, only one `typeof`-guarded) — the same silent fingerprint
+  // degradation that `print` caused. Aliasing the window's implementation
+  // shadows nothing on the host.
   // NOTE: `print` was removed from this list (2026-08-29). The polyfill
   // defines a harmless no-op on the window, but the alias pass skipped it,
   // so under Bun (guest scripts run in the HOST realm) the Aliyun pe risk