I was having the same issue even with the new version. But managed to find a way to solve it.
On the edit course page
– create a section and give it a title
– Press the select lesson button
– Type the title of your lesson into the box
– When it can’t find it, add new item
– Create the page (I used my page name to be the same as the lesson name)
– The go back to the course edit window and close the pop up
– Then press Add lesson again and it should show up.
– Select and add.
Hope this helps, I suffered for ages trying to get the fucker to work.
