Instead of displaying the html, the Nextjs app loads plain text.

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There could be several reasons why your Nextjs app is loading plain text instead of HTML. Here are a few things you can check:

1. Check your server-side code: Make sure that your server-side code is correctly rendering your HTML content. The most common cause of this issue is that your server-side code is returning plain text instead of HTML. Check the code that generates your HTML and make sure it's working correctly.

2. Check your browser's developer console: Open the developer console in your browser and check to see if there are any errors or warnings related to the HTML rendering. This can give you some clues as to what's going wrong.

3. Check your CSS and JavaScript files: Make sure that your CSS and JavaScript files are being loaded correctly. If your HTML depends on external CSS or JavaScript files, make sure they're being loaded correctly.

4. Check your server-side framework: If you're using a server-side framework like Express or Koa, make sure it's configured correctly. Some frameworks have specific settings that can affect how HTML is rendered.

5. Check for caching issues: If you're using a CDN or other caching mechanism, make sure it's not caching the plain text instead of the HTML. Try clearing your cache and reloading the page.

By checking and addressing these potential issues, you should be able to get your Nextjs app to display HTML instead of plain text.