How to reproduce:
- Create a new course (learning path or conventional)
- Open course editor
- Add 2 folder course elements (it must be at least 2)
- On the top course node: open the tab "Overview"
- Select "Automatically generated overview incl. preview"
- Close the editor and publish the course
- NOK: Automatic overview with preview is not displayed. You need to open the course editor and the "Overview" tab again, select another option and re-select the automatic preview to make it work.
- OK: Preview is shown right away after publishing.
Same behaviour with the automatic preview on structure course elements.