With the recent changes in WordPress and the introduction of Twenty Twenty-Five, the header no longer appears automatically when creating new pages. The current lesson script assumes that a header pattern is always visible at the top of the page, but in the latest version this is not the case.

For clarity, I suggest updating the instruction: https://learn.wordpress.org/lesson/setting-up-your-pages-posts-site-logo-and-navigation-menu/ to explain that:

• The header now comes from the template part system rather than being automatically inserted with new pages.
• If users don’t see a header, they need to open the Site Editor → Templates (e.g., Page or Front Page) and add or create a Header template part.
• Inside the Header, they can place Site Logo, Navigation, and other blocks.