Next 15.0.0-rc.0 App router - base sitemap 404 not found

[nicevlhjfihtqngkldl]

Just have a basic src/app/sitemap.ts defined:

import type { MetadataRoute } from 'next'
 
export default function sitemap(): MetadataRoute.Sitemap {
  return [
    {
      url: 'https://acme.com',
      lastModified: new Date(),
      changeFrequency: 'yearly',
      priority: 1,
    },
    {
      url: 'https://acme.com/about',
      lastModified: new Date(),
      changeFrequency: 'monthly',
      priority: 0.8,
    },
    {
      url: 'https://acme.com/blog',
      lastModified: new Date(),
      changeFrequency: 'weekly',
      priority: 0.5,
    },
  ]
}

When I do npm run dev - neither of the following URLs are found: -http://localhost:3000/sitemap.xml -http://localhost:3000/sitemap.xml/0.1

I just get redirected to the not found page.

This is next 15.0.0-rc.0