Lessons do not appear in the courses

After upgrading to version 4.1.7.1 the lessons are not displayed inside the sections (frontend and backend) but they are saved in the database without any problem.

I have done a clean install of WP on localhost and on a server but it does not work, I also updated the permalinks with /%postname%/ after installing the plugin.

When update Course post, the lesson dissapear

https://gifyu.com/image/S3Vpi