After setting syntax-propertize-function, comment is not being fontified with comment face

Question

I'm trying to build a major mode for xwiki, where I'm defining

{{{
verbatim
}}}

as a comment.

So far, I've done

    (eval-when-compile
      (defconst xwiki-syntax-propertize-rules
        (syntax-propertize-precompile-rules
         ("{{{" (0 "< b"))
         ("}}}" (0 "> b")))))

     (setq-local syntax-propertize-function (syntax-propertize-rules xwiki-syntax-propertize-rules))

When I do describe-char, on any of the characters in {{{, I see that it is identified as a comment style b. I also see }}} identified as comment style b.

However, under text properties, there's nothing set for face. Am I missing something?

Answer 1

The above code will indeed set something for face. @Lindydancer helped me realize that I had set font-lock-defaults with the second parameter (keywords-only) of the list as t).

Unsetting keywords-only fixed the above and enabled highlighting.

Also, with

(eval-when-compile
  (defconst xwiki-syntax-propertize-rules
    (syntax-propertize-precompile-rules
     ("{{{" (0 "< b"))
     ("}}}" (0 "> b")))))

The last two }} did not get fontified with the comment face, but with

(eval-when-compile
  (defconst xwiki-syntax-propertize-rules
    (syntax-propertize-precompile-rules
     ("\\({\\){{" (1 "< b"))
     ("}}\\(}\\)" (1 "> b")))))

It gets fontified correctly - {{{, }}}, and everything between those get fontified as comments.