I've started this discussion tophf/mpiv#50
and the text in backticks is not rendered, not in the post title, in the listing,
even though the parse-backticks feature is listed ok in Console ()

There's no error in Console.

Using Refined GitHub 21.2.9 with Chrome 88/Firefox 85.

If I may help, checking https://github.com/sindresorhus/refined-github/blob/main/source/features/parse-backticks.tsx I see there's no selector for Discussion pages/listings.
I think these would be:

• .js-issue-title for discussion pages
• a[data-hovercard-type="discussion"] for discussion listings

Thank you