SSG in hash mode generates wrong URLs

[Voltra]

Steps to reproduce:

1. Create a Nuxt project
2. Configure its router's mode to "hash"
3. Create a page or two
4. Install and configure the sitemap plugin (sample hostnames: http://localhost:3000, http://localhost:3000/#, http://localhost:3000/#/)
5. Run nuxt generate
6. Start a server in the build directory
7. Go to the sitemap URL

Expected behavior:
URLs present in the sitemap would include the hash part

Observed behavior:
URLs present in the sitemap omit the hash part (e.g. what should be http://localhost:3000/#/test becomes http://localhost:3000/test in the sitemap)

Versions:

• @nuxtjs/i18n : ^7.2.2
• @nuxtjs/sitemap: ^2.4.0
• nuxt: ^2.15.7