When setting this option:

#+begin_src emacs-lisp
(setq org-list-demote-modify-bullet '(("+" . "-") ("-" . "+") ("*" . "+")))
#+end_src

I right shift list checkbox with [Alt-Right] caused error:

#+begin_src org
,* test

- [ ] list item 1
- [ ] list item 2

Become:

- [ ] list item 1
  [ ] ] list item 2
#+end_src


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