bug#46531: 27.1; Edebug breaks when using :append in minibuffer-with-setup-hook

[Clemens]

When stepping via edebug through

(defun check ()
  (interactive)
  (minibuffer-with-setup-hook
      (:append (lambda () (insert "world")))
    (read-string "Hello ")))

you get "Symbol's function definition is void: :append" error when 
reaching the :append and can't proceed.


    Clemens