feat(web): Level 2 navigation for parent subpages should be visible d…

…espite theme (#17100)

Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>

apps/web/pages/s/[...slugs]/index.tsx

@@ -320,13 +320,17 @@ Component.getProps = async (context) => {
       }
     }
 
-    if (isStandaloneTheme) {
+    try {
       return {
         page: {
           type: PageType.STANDALONE_PARENT_SUBPAGE,
           props: await StandaloneParentSubpage.getProps(modifiedContext),
         },
       }
+    } catch (error) {
+      if (!(error instanceof CustomNextError)) {
+        throw error
+      }
     }
 
     return {