Hi,

I'm encountering an issue with Next.js where my static export process is not generating index.html files for certain directory routes. Specifically, I have a directory named designs with a page.tsx inside it, and I expected Next.js to generate an index.html in the out/designs folder upon export. However, this is not happening.

Here's the structure of my pages directory:
/pages /designs page.tsx /site-notice page.tsx

After running next export, the out folder has a site-notice.html as expected, but there's no index.html in the out/designs folder. Instead, I only see HTML files for dynamically generated routes like letter-a-shirt.html.

Here's what the out/designs directory looks like after export:
/out /designs letters.html ...

I've tried various configurations in next.config.js, including setting trailingSlash: false, but the issue persists. I'm not sure if I'm missing a configuration step or if this is a bug with Next.js.

Has anyone else faced this issue, or does anyone have insights on how to ensure index.html is generated for directory routes during the static export process?

Any help or guidance would be greatly appreciated!