Steps to reproduce:
- Login as admin
- Go to /admin/settings.php?section=frontpagesettings
- Set an arbitrary "Front page summary"
- Activate "Include a topic section"
Now, as described on https://docs.moodle.org/27/en/Course/site_summary_block, the frontpage summary should appear in the centre of the front page. This isn't true. It only appears in the site summary block if this block is used.