Just sub it once

src/pages/notifications.jsx

@@ -247,7 +247,6 @@ function Notifications({ columnMode }) {
 
   const lastHiddenTime = useRef();
   usePageVisibility((visible) => {
-    let unsub;
     if (visible) {
       const timeDiff = Date.now() - lastHiddenTime.current;
       if (!lastHiddenTime.current || timeDiff > 1000 * 3) {
@@ -258,20 +257,16 @@ function Notifications({ columnMode }) {
       } else {
         lastHiddenTime.current = Date.now();
       }
-      unsub = subscribeKey(states, 'notificationsShowNew', (v) => {
-        if (uiState === 'loading') {
-          return;
-        }
-        if (v) {
-          loadUpdates();
-        }
-        setShowNew(v);
-      });
     }
-    return () => {
-      unsub?.();
-    };
   });
+  useEffect(() => {
+    let unsub = subscribeKey(states, 'notificationsShowNew', (v) => {
+      if (uiState === 'loading') return;
+      if (v) loadUpdates();
+      setShowNew(v);
+    });
+    return () => unsub?.();
+  }, []);
 
   const todayDate = new Date();
   const yesterdayDate = new Date(todayDate - 24 * 60 * 60 * 1000);