Yoast/wordpress-seo — pull request #1163 by jakub-klapka (2014-05-23 07:36:24+00:00)
Title: Fixed unreachable filter wpseo_sitemap_[post_type]_content

There was condition, which would run the filter only on first page on sitemap. This condition would never be true in old code.
I'm referencing issues https://github.com/Yoast/wordpress-seo/issues/1156 and https://github.com/Yoast/wordpress-seo/issues/963