Ok I'm now fairly certain it's a bug. I'm attaching a minimum
org-file that reproduces the issue with `emacs -Q` for me.

~lou

* This is a header with a timestamp
<2025-12-09 Di 12:00-14:00>

To Reproduce the warning the timestamp must be for the current day *and* have a
time component.

#+begin_src emacs-lisp
  (setq org-agenda-files (list (buffer-file-name (current-buffer))))
  (setq org-agenda-prefix-format '((agenda . "%(org-get-category)")))
  (org-agenda)
#+end_src

#+RESULTS:

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