Function org-compile-prefix-format in file org-agenda.el (line 6917 in Org 9.5.2) does not properly document parameter `key'.
Emacs : GNU Emacs 27.2 (build 1, x86_64-pc-linux-gnu, X toolkit, Xaw3d scroll bars) of 2021-08-28 Package: Org mode version 9.5.2 (9.5.2-gfbff08 @ /home/phil/.emacs.d/elpa/org-9.5.2/)
