diff --git a/frontend/dashboard.js b/frontend/dashboard.js
index 0c5bf3e..1a4e850 100644
--- a/frontend/dashboard.js
+++ b/frontend/dashboard.js
@@ -7388,8 +7388,9 @@
   updateDeliveryReceiptControls();
   if (!navigator.onLine) await showOfflineStatus();
   window.addEventListener('offline', showOfflineStatus);
-  window.addEventListener('online', reconnectOutboxes);
-  workspaceLifecycle.replayOnline(reconnectOutboxes);
+  const reconnectAfterOnline = () => setTimeout(reconnectOutboxes, 500);
+  window.addEventListener('online', reconnectAfterOnline);
+  workspaceLifecycle.replayOnline(reconnectAfterOnline);
 
   qs('#refresh').addEventListener('click', load);
   qs('#plan-today').addEventListener('click', event => openPlanToday(event.currentTarget));
diff --git a/frontend/service-worker.js b/frontend/service-worker.js
index 69bdb74..bbdeb68 100644
--- a/frontend/service-worker.js
+++ b/frontend/service-worker.js
@@ -383,6 +383,17 @@ async function warmOptionalFeature(cache, staleCacheNames, asset) {
   await cache.add(asset);
 }
 
+async function cachedOptionalFeature(request) {
+  const cached = await caches.match(request);
+  if (cached) return cached;
+  const response = await fetch(request);
+  if (response.ok) {
+    const cache = await caches.open(CACHE);
+    await cache.put(request, response.clone());
+  }
+  return response;
+}
+
 self.addEventListener('activate', event => {
   event.waitUntil((async () => {
     const keys = await caches.keys();
@@ -635,6 +646,6 @@ self.addEventListener('fetch', event => {
     return;
   }
   if (url.origin === self.location.origin && OPTIONAL_FEATURES.includes(url.pathname)) {
-    event.respondWith(caches.match(request).then(cached => cached || fetch(request)));
+    event.respondWith(cachedOptionalFeature(request));
   }
 });
diff --git a/tests/test_reconnect_outboxes.py b/tests/test_reconnect_outboxes.py
index 28b91ab..01485dc 100644
--- a/tests/test_reconnect_outboxes.py
+++ b/tests/test_reconnect_outboxes.py
@@ -48,4 +48,5 @@ def test_dashboard_uses_reconnect_flush_after_live_identity_refresh():
     assert '<script src="static/reconnect-outboxes.js"></script>' in index
     assert "const reconnectOutboxes = createReconnectOutboxes({" in dashboard
     assert "restoreIdentity: login => { activeFlushLogin = login; confirmedOwnerLogin = login; }" in dashboard
-    assert "window.addEventListener('online', reconnectOutboxes);" in dashboard
+    assert "window.addEventListener('online', reconnectAfterOnline);" in dashboard
+    assert "setTimeout(reconnectOutboxes, 500)" in dashboard
diff --git a/tests/test_service_worker.py b/tests/test_service_worker.py
index 628e45d..0d22430 100644
--- a/tests/test_service_worker.py
+++ b/tests/test_service_worker.py
@@ -1108,6 +1108,25 @@ def test_offline_activation_migrates_cached_optional_feature_before_deleting_old
     assert state["claimed"] is True
 
 
+def test_successful_optional_feature_fetch_is_cached_for_offline_reopen():
+    result = run_worker_scenario(
+        """
+  const asset = '/dashboard/feature-today-timer-test.js';
+  context.self.__testOptionalFeatures.push(asset);
+  const response = await dispatch('fetch', {
+    method: 'GET', mode: 'cors',
+    url: 'https://forge.example/dashboard/feature-today-timer-test.js',
+  });
+  process.stdout.write(JSON.stringify({ body: await response.text(), state }));
+"""
+    )
+
+    assert result["body"] == "network"
+    assert result["state"]["puts"] == [
+        "https://forge.example/dashboard/feature-today-timer-test.js"
+    ]
+
+
 def test_activate_warms_optional_features_without_blocking_siblings_or_claim():
     result = run_worker_scenario(
         """