next js sitemaps///

I need a (BACKEND) [login to view URL] developer, who can help me with the below fixes: TASK #1 > the app uses getServerSideProps to generate dynamic routes and the next-sitemap package to generate dynamic sitemaps. since the getServerSideProps routes are only generated at request time, the routes are not in the generated sitemaps. However, I want the sitemaps to include all the possible routes {hundreds of millions} so I can submit the index sitemaps to Google Search Console. Here's the flowchart: [login to view URL] TASK #2 > the app works fine in localhost without any errors. However, each time I visit any route from the deployed version, I constantly get [(Application error: a client-side exception has occurred (see the browser console for more information).] until I refresh more than 5 times for the error to disappear. Routes that don't have the marquee work fine in production, but routes where the marquee is shown often throw the error. Therefore, I think the [login to view URL] file is the problem here. demo video here: [login to view URL]