If defined the router base in nuxt.config.js file, the links in the sitemap file did not consider that.
router: {
base: '/something/'
}
When creating the links in the sitemap file, It would be nice that consider the router base to make the real link.
Good catch!
It's a very old bug ๐ฑ
Thanks for your report @mojtaba06 ๐
I will fix it ASAP.