When setting the prefixDefaultLocale = false, fallback to default is not working at homepage.

[dande-sun]

Astro Info

Astro                    v4.5.12
Node                     v20.8.1
System                   Linux (x64)
Package Manager          npm
Output                   server
Adapter                  @astrojs/node
Integrations             @astrojs/react
                         @astrojs/vue
                         @astrojs/tailwind
                         @astrojs/mdx
                         @astrojs/partytown
                         client:eager

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

Chrome

Describe the Bug

when setting below options, the fallback for SG homepage is not working, the Location in response is a null string.
i18n: { defaultLocale: "default", locales: [ "default", "fr", ], fallback: { "fr": 'default' }, routing: { prefixDefaultLocale: false } }, trailingSlash: "never"

This is the response,
Request URL: https://astro.avepoint.com/uk Request Method: GET Status Code: 302 Found Remote Address: 10.1.0.182:443 Referrer Policy: strict-origin-when-cross-origin Date: Tue, 09 Apr 2024 07:31:48 GMT Last-Modified: Tuesday, 09-Apr-2024 07:31:48 UTC Location: Referrer-Policy: no-referrer-when-downgrade

What's the expected result?

It's should be fallback to default homepage.

Link to Minimal Reproducible Example

https://stackblitz.com/edit/github-xfj9kv?file=astro.config.mjs

Participation

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

[ematipico]

Can you please create a valid reproduction? The reproduction uses the fr language, but then the pages/ folder contains a es/ folder instead.

Also, when running astro build, I can see the emitted files as expected.

[github-actions]

Hello @dande-sun. Please provide a minimal reproduction using a GitHub repository or StackBlitz. Issues marked with needs repro will be closed if they have no activity within 3 days.

[dande-sun]

@ematipico, the fr only an example, I set the fallback fr to default, but there not have the fr homepage, it should be fallback to default homepage, the bug does not need astro build, in the dev mod is same too.
Anyway I updated the reproduction, https://stackblitz.com/edit/github-xfj9kv

[ematipico]

@dande-sun: thank you