I want basically do this:

export async function generateStaticParams() {
    return [{ lang: "en" }, { lang: "fr" }, { lang: undefined }];

My structure is
app
- [lang]
- second

I want to create
- /
- /second
- /en
- /en/second
- /fr
- /fr/second

Note this is a static export (output: export)

But building results in:

I'm missing / and /second

Tried catch all and optional catch all, but you have to have it as the last item :/