?bug in org-fold-core

[Sharon Kimble <boudiccas@skimble09.plus.com>]

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I've just updated to 'Org mode version 9.5.4 (release_9.5.4-706-g4702a7 @ /home/boudiccas/git/org-mode/lisp/)' and I'm getting this error report from org-fold-core (I think) -

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Debugger entered--Lisp error: (error "Calling ‘org-fold-core-region’ with missing SPEC")
  signal(error ("Calling ‘org-fold-core-region’ with missing SPEC"))
  error("Calling `org-fold-core-region' with missing SPEC")
  org-fold-core-region(652018 652093 t outline)
  org-cycle-content--text-properties(2)
  org-content(2)
  eval((org-content 2) t)
  #f(compiled-function (var val) "Set local variable VAR with value VAL.\nIf VAR is `mode', call `VAL-mode' as a function unless it's\nalready the major mode." #<bytecode 0x18c3ed15a476992f>)(eval (org-content 2))
  apply(#f(compiled-function (var val) "Set local variable VAR with value VAL.\nIf VAR is `mode', call `VAL-mode' as a function unless it's\nalready the major mode." #<bytecode 0x18c3ed15a476992f>) (eval (org-content 2)))
  hack-one-local-variable(eval (org-content 2))
  hack-local-variables-apply()
  hack-local-variables(ignore-mode-settings)
  org-mode()
  set-auto-mode-0(org-mode nil)
  set-auto-mode()
  normal-mode(t)
  after-find-file(nil t)
  find-file-noselect-1(#<buffer instructions.org> "~/.emacs.d/org/instructions.org" nil nil "~/.emacs.d/org/instructions.org" (34277755 2068))
  find-file-noselect("/home/boudiccas/.emacs.d/org/instructions.org")
  desktop-restore-file-buffer("/home/boudiccas/.emacs.d/org/instructions.org" "instructions.org" nil)
  byte-code("\10\11\236A\206\10\0\305\n\13\f#\207" [desktop-buffer-major-mode desktop-buffer-mode-handlers desktop-buffer-file-name desktop-buffer-name desktop-buffer-misc desktop-restore-file-buffer] 4)
  desktop-create-buffer(206 "/home/boudiccas/.emacs.d/org/instructions.org" "instructions.org" org-mode (auto-fill-mode abbrev-mode visual-line-mode override-global-mode anzu-mode auto-complete-mode TeX-PDF-mode highlight-symbol-mode global-auto-revert-mode org-indent-mode flyspell-mode yas-minor-mode undo-tree-mode hi-lock-mode guide-key-mode hungry-delete-mode which-key-mode flx-ido-mode ivy-mode wrap-region-mode google-this-mode org-autolist-mode project-persist-mode super-save-mode ivy-explorer-mode counsel-mode auto-capitalize) 13221 (13959 nil) nil nil ((indent-tabs-mode) (buffer-display-time 25316 54568 39118 551000) (buffer-file-coding-system . utf-8-unix) (truncate-lines)))
  eval-buffer(#<buffer  *load*-245945> nil "/home/boudiccas/.emacs.d/desktop/emacs.desktop" nil t)  ; Reading at buffer position 24870
  load-with-code-conversion("/home/boudiccas/.emacs.d/desktop/emacs.desktop" "/home/boudiccas/.emacs.d/desktop/emacs.desktop" t t)
  load("/home/boudiccas/.emacs.d/desktop/emacs.desktop" t t t)
  desktop-read()
  eval-buffer(#<buffer  *load*-137324> nil "/home/boudiccas/.emacs.d/config22.el" nil t)  ; Reading at buffer position 478700
  load-with-code-conversion("/home/boudiccas/.emacs.d/config22.el" "/home/boudiccas/.emacs.d/config22.el" nil nil)
  load("/home/boudiccas/.emacs.d/config22.el" nil nil t)
  load-file("~/.emacs.d/config22.el")
  org-babel-load-file("~/.emacs.d/config22.org")
  eval-buffer(#<buffer  *load*> nil "/home/boudiccas/.emacs.d/init.el" nil t)  ; Reading at buffer position 471
  load-with-code-conversion("/home/boudiccas/.emacs.d/init.el" "/home/boudiccas/.emacs.d/init.el" t t)
  load("/home/boudiccas/.emacs.d/init" noerror nomessage)
  startup--load-user-init-file(#f(compiled-function () #<bytecode -0x177562bdbd07ff8b>) #f(compiled-function () #<bytecode -0x1f3c6feddc0abd75>) t)
  command-line()
  normal-top-level()
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I've attempted to run bug-hunter-file against it, and its says that there are no problems with it, so I'm puzzled as to what's going on?

Is it a bug against org-fold-core, or something in my file, please?    

Thanks
    Sharon.
- -- 
A taste of linux = http://www.sharons.org.uk
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Debian 11, fluxbox 1.3.7, emacs 29.0.50, org 9.5.4
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