This is not a question but a call out to just a little bit of what @StPaulTim and his team have done for the backdrop community. Today, I stumbled upon a demo theme switcher site where users can scroll down to the footer and select one of a number of different backdrop core and contrib themes to see what they look like. Very nicely done. https://themeswitcher.simplo.site/
Recent comments
No one has reported such a problem. If you could provide reproducible steps to replicate the problem, it might help us resolve it.
xmlsitemap module generates wrong links for languages
I mean, what ever option(s) i chose, all language links are added to the sitemap without exceptions. This is the problem i get with either modules.
xmlsitemap module generates wrong links for languages
If that works better for you, then so be it. But what did you mean when you said, "that is not language sensitive either"?
xmlsitemap module generates wrong links for languages
i tried that module and that is not language sensitive either. So, it is better to stick with xml sitemap module.
xmlsitemap module generates wrong links for languages
While problem is there, you may want to try simplified solution: Easy XML sitemap.
xmlsitemap module generates wrong links for languages