If you globally rebind M-q, then `org-fill-paragraph' will not work properly anymore. The reason is that `org-fill-element' has the line (src-block (org-babel-do-key-sequence-in-edit-buffer (kbd "M-q"))) While of course M-q is the default binding for `fill-paragraph', org should respect that the user might want to change keybindings. Emacs : GNU Emacs 28.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.30, cairo version 1.17.4) of 2021-08-13 Package: Org mode version 9.4.6 (9.4.6-12-gdcc3a8-elpa @ /home/mwj/.emacs.d/elpa/org-20210809/)