As of commit 7769518f3, source code blocks are no longer natively fontified when org-src-fontify-natively is set to t.
To reproduce, create an org-mode buffer and insert: #+BEGIN_SRC emacs-lisp (setq foo 'foo) #+END_SRC Expected: setq is fontified according to font-lock-keyword-face. Actual: setq is fontified according to org-block. Unfortunately I can't think of anything else worth mentioning. Thank you in advance. Emacs : GNU Emacs 27.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.22, cairo version 1.17.3) of 2020-08-28 Package: Org mode version 9.3.7 (release_9.3.7-802-g9f0af6 @ /home/nicolas/.config/emacs/straight/build/org-plus-contrib/) -- Nicolas De Jaeghere