Astro Info

$ npx astro info
Astro                    v5.7.9
Node                     v23.9.0
System                   Linux (x64)
Package Manager          npm
Output                   server
Adapter                  @astrojs/cloudflare
Integrations             none

If this issue only occurs in one browser, which browser is a problem?

No response

Describe the Bug

Astro.config.mjs as follows:

{
  // ...
  i18n: {
    defaultLocale: "en",
    locales: [
      { path: "en", codes: ["en", "en-US"] },
      { path: "zh-hans", codes: ["zh-hans", "zh-CN"] },
      { path: 'fr', codes: ['fr'] },
    ],
    routing: {
      prefixDefaultLocale: false,
      redirectToDefaultLocale: true,
      fallbackType: "redirect",
    },
    fallback: {
      "fr": "en",
    },
  },
  // ...
}

However, I got infinite redirects when accessing /fr.

The redirect works when setting fallback as {"fr": "zh-hans"}, which has prefix locale on the URL.

What's the expected result?

Navigate to /fr (page not found) then redirect the default locale (/ in this case).

Link to Minimal Reproducible Example

https://stackblitz.com/edit/github-n1hg4cfb?file=astro.config.mjs

Participation

• I am willing to submit a pull request for this issue.