Defun forms not highlighting correctly with &key parameters which have default values

[Fractangle]

In the following code, defun and wrong1 are not highlighted, but the (+ 3 4) is:

(defun wrong1 (&key (has-default (+ 3 4)))
  (+ has-default 1))

However, if we replace (+ 3 4) with 7, then the 7 is not highlighted, but defun and wrong2 are:

(defun wrong2 (&key (has-default 7))
  (+ has-default 1))