Problem/Motivation
When we save config "DEFAULT BASE URL" in settings module this work for multilanguage with a path prefix, but if the used domain for language that the problem because for other language have one Base URL.
Proposed resolution
I think should give up base URL or leave it blank. Or move the base URL configuration to the form of a specific sitemapxml in list sitemaps (/admin/config/search/xmlsitemap).
The result after apply patch
