expandReplies and fetchMore don't work.

They return the unchanged length of comments

const commentsArr = await r.getSubmission(req.body.postId).expandReplies({ depth: 2, limit: 2 });

or

const commentsArr = await r.getSubmission(req.body.postId).comments.fetchMore({ amount: 2 });

I want to get only 2 comments with 2 replies.