Line 32 and 33 of org-id.el state: ;; Identifiers consist of a prefix (default "Org" given by the variable ;; `org-id-prefix') ...
I think that should now read: ;; Identifiers may consist of a prefix (given by the variable ;; `org-id-prefix') ... as the default for org-id-prefix is now nil for no prefix. Stephen Emacs : GNU Emacs 29.1 (build 2, aarch64-apple-darwin22.5.0, NS appkit-2299.60 Version 13.4.1 (c) (Build 22F770820d)) of 2023-08-05 Package: Org mode version 9.7-pre (release_9.6.11-923-g6f960f @ /Users/stephen/.emacs.d/straight/build/org/)