Reply to Post

There seems to be a problem with replying to forum posts when using Corporacy. If I switch to Twenty Twenty-Two 1.2 theme then it works correctly.
The problem is that when a post is displayed it has the link xxx.com/post-name/#respond with the title “leave a reply”. But clicking this simply shows the full post but no form to enter a reply.
As I say, switching to a standard theme fixes this.