bbpress schema

I’ve followed the instructions for enabling bbpress schema here: https://structured-data-for-wp.com/docs/article/how-to-enable-bbpress-support-schema/

However, when viewing a topic page the replies are not marked up with the comment/text schema. Only the opening post gets the DiscussionForumPosting markup — the replies get nothing.

How can I ensure that replies are also marked up on forum topic pages?