This might be a known bug, but just in case it isn't: I'm getting an error message ("Could not find the comment you're replying to on the page. It might have been deleted or moved to another page. Please reload the page and try again.") when trying to reply to a comment on w:en:Wikipedia:Wikipedia Signpost/2021-10-31/News and notes.
This may have something to do with the comment section being transcluded from the corresponding talk page. Leaving a message using the reply tool directly on w:en:Wikipedia talk:Wikipedia Signpost/2021-10-31/News and notes seems to work.
(Additionally, I can't seem to paste the Signpost page title in this edit box.)