maxoud on "[Plugin: Polylang] "WP SEO" sitemap and translation subdomain issue"

I have a site under development using subdomains for translated pages and using Yoast's WordPress SEO plugin to generate XML sitemaps (including but not limited to).

WP SEO generates sitemap for the main domain, e.g

http://mydomain.dev/sitemap_index.xml
http://mydomain.dev/page-sitemap.xml

but not for subdomain, e.g.

http://ru.mydomain.dev/sitemap_index.xml
http://ru.mydomain.dev/page-sitemap.xml

The content of the sitemap generated for any subdomain appears to be the same as for main domain, I mean purely default language pages.

Is there any known workaround to generate sitemaps for subdomains?
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Wordpress 4.0, both custom and default themes;
Only two plugins:

• Polylang 1.5.5
• WordPress SEO 1.6.3

https://wordpress.org/plugins/polylang/