fix(core): fix page loading shimmer (#5027)

packages/frontend/core/src/pages/workspace/detail-page.tsx

@@ -158,7 +158,7 @@ export const DetailPage = (): ReactElement => {
   // wait for page to be loaded
   useEffect(() => {
     if (page) {
-      if (!page.loaded) {
+      if (!page.isEmpty) {
         setPageLoaded(true);
       } else {
         setPageLoaded(false);