Locales duplicated in locales.value

[domzo63]

Environment

• OS: Windows 11
• Node: 22.14.0
• Package manager: pnpm 10.11.0
• Nuxt: 4.0.2
• @nuxtjs/i18n: 10.2.1
• SSR: enabled
• Bundler: Vite (default)
• Build mode: development
• lazy translation loading: enabled
• strategy: "no_prefix"
• detectBrowserLanguage: enabled

Reproduction

nuxt.config.ts

export default defineNuxtConfig({
  modules: ['@nuxtjs/i18n'],

  i18n: {
    defaultLocale: 'en',
    detectBrowserLanguage: false,
    locales: [
      { code: 'en', name: 'English', file: 'en.json' },
      { code: 'hr', name: 'Hrvatski', file: 'hr.json' },
    ],
  },
});

app/layouts/default.vue:

const { locales } = useI18n();
console.log(locales.value);

output:

[
  { code: 'en', name: 'English', language: '' },
  { code: 'hr', name: 'Hrvatski', language: '' },
  { code: 'en', name: 'English', file: 'en.json' },
  { code: 'hr', name: 'Hrvatski', file: 'hr.json' }
]

Describe the bug

When using @nuxtjs/i18n version 10.2.1 with lazy-loaded translations and strategy: "no_prefix", locales.value contains duplicate locale entries.
Even though I define only two locales (en and hr), locales.value returns four:
two correct locales (with file)
two internally generated locales (without file)
This breaks language switchers and UI components that rely on locales.value.

Additional context

No response

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