This is page 2 of the blog listing. Because it is a paginated view of the same content, it points its canonical back to page 1 (Blog page 1).
The canonical tag in the <head> of this page reads:
<link rel="canonical" href="https://robots-txt-lab.pages.dev/blog">
A sitemap should only list the canonical URL (/blog), not every paginated variant.
Including /blog-page-2 in the sitemap sends a contradictory signal to Google.