Rails tutorial "Delete 13.3.4 Microposts" fails

Rails Tutorial Chapter 13, 13.3.4 Delete Microposts does not work.
As a symptom, clicking on the Delete Micropost link takes you to the Home page, and the micropost that you clicked delete remains.

We have checked the debugs to see that @micropost in the correct_user method in micropost_controller.rb is nil, but the debug will return the replacement expression current_user.microposts.find_by (id:params[:id]).If anyone has seen a similar phenomenon, I would appreciate it if you could give me some advice.