Start emacs -Q and evaluate the following with *scratch*.

(set-face-foreground 'font-lock-comment-face "green")
(set-face-foreground 'font-lock-comment-delimiter-face "red")

Open `foo.lisp' with C-x C-f and enter as follows.

#|
comment
|#

As a result, the correct face is not assigned to the closing delimiter.

#|      <- font-lock-comment-delimiter-face
comment <- font-lock-comment-face
|#      <- font-lock-comment-face <- Wrong face

Occurs in Emacs 25.2, 26.1 and 27.0.60.

Normally, both colors are the same, so no one may have noticed until now.
I noticed recently because I was using a zenburn theme with slightly
different colors.

-- 
chuntaro