this is my current config for agenda

          (agenda ""
                  ((org-agenda-skip-function
                    '(org-agenda-skip-entry-if 'deadline)
                    )
                   (org-agenda-skip-function
                    '(org-agenda-skip-entry-if 'regexp "\\* DAILY")
                    )
                   (org-agenda-prefix-format " %i  %-12:c [%-2e] %?-12t% s")
                   (org-deadline-warning-days 0)
                   (org-agenda-start-day "0d")
                   (org-agenda-span 'day)
                   ))

there is empty agenda heading every 2 hours (8:00, 10:00, 12:00, etc until 20:00)

https://preview.redd.it/80euw3opiu2c1.png?width=1508&format=png&auto=webp&s=16c09d47b7efbeb44f67cf05d71d4582ade8a6ef