How can the issue of wrongly rendered initial UI leading to hydration failure be resolved in the experimental app directory folder for NextJS?

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To resolve the issue of wrongly rendered initial UI in the experimental app directory folder for NextJS, you can follow these steps:

1. First, make sure that your page components are compatible with server-side rendering (SSR). Any code that accesses the browser's APIs or global variables will not work on the server and can cause hydration failures.

2. Try to reproduce the rendering issue locally by running the app in development mode and inspecting the HTML output. Look for differences between the client-side and server-side rendered HTML.

3. If you're using static data in your page components, make sure to fetch it using getStaticProps or getServerSideProps to ensure that it's available during server-side rendering.

4. Check for any components that rely on the browser's window object, such as components that use window.innerHeight to calculate their size. These components will not work on the server and should be avoided or wrapped in a check for window object existence.

5. If the issue persists, try disabling client-side rendering (CSR) by setting the "hydrate" prop to false on the <hydrate> component in your _app.js file. This will force the app to re-render on the client and can help identify the cause of the issue.

6. As a last resort, you can try using dynamic imports to lazy load components that may be causing the hydration failure, or using a different rendering strategy, such as static site generation (SSG).

By following these steps and ensuring that your components are compatible with server-side rendering, you can resolve issues with wrongly rendered initial UI and achieve a successful hydration process in your NextJS experimental app directory folder.