Can't install using Straight.el: `Wrong type argument: listp, 1` about helpful HOT 2 OPEN

;; We have to specify how to install and load elisp-refs.el
(use-package elisp-refs
  :demand t
  :straight
  (elisp-refs :type git :host github :repo "Wilfred/elisp-refs"
                   ;; Skip the autoloads phase because straight.el can't seem to get it right.
                   :build (:not autoloads)))

(use-package helpful
    ;; THIS IS NEW: We must wait until elisp-refs has loaded, otherwise helpful will try its own
    ;; recipe for installing elisp-refs, which will break.
    :after elisp-refs
    :ensure t
    :defer t
    ;; No need for a :straight directive at all anymore.
    :general
    (general-def
      ;; Replace standard help functions with helpful functions.
      "C-h f" 'helpful-callable
      "C-h v" 'helpful-variable
      "C-h k" 'helpful-key
      ;; Other useful keybindings.
      "C-h C" 'helpful-command
      "C-h F" 'helpful-function)
    (my/user-leader-def
      "C-d" 'helpful-at-point)
    (general-def 'normal emacs-lisp-mode-map
      "K" 'helpful-at-point))

  (use-package helpful
    :ensure t
    :defer t
    ;; THIS IS THE NEW PART
    :straight
    (helpful :type git :host github :repo "Wilfred/helpful"
             ;; Disable native-compilation when installing helpful to avoid compile-time error.
             :build (:not native-compile))
    :general
    (general-def
      ;; Replace standard help functions with helpful functions.
      "C-h f" 'helpful-callable
      "C-h v" 'helpful-variable
      "C-h k" 'helpful-key
      ;; Other useful keybindings.
      "C-h C" 'helpful-command
      "C-h F" 'helpful-function)
    (my/user-leader-def
      "C-d" 'helpful-at-point)
    (general-def 'normal emacs-lisp-mode-map
      "K" 'helpful-at-point))