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:
