How to force sitemap update?

Hello,
I excluded some custom posts from the sitemap checking the relative “Exclude From Sitemap” field.

However I still see those posts in the sitemap.

If I UNcheck the “Dynamically Generate Sitemap” field, the static sitemap is updated and I don’t see the excluded posts.

If I enable again the Dynamically Generate Sitemap, the excluded posts are still there?

Is there a way to force an update on the dynamically generated sitemap to check whether the exclusion of the posts is working or not?

Thank you