https://wpml.org/errata/different-sitemaps-per-language-while-using-wordpress-seo-by-yoast/
Different sitemaps per language while using Wordpress SEO by Yoast - WPML
May 18, 2021 - When using Wordpress SEO by Yoast, separate sitemaps for each language should be created only when using a different domain per language. Currently, every
wordpress seo by yoastdifferentsitemapsperlanguage