datitisev You can use it without migrating, the migration just makes the slug unique so there are no pages with the same slug
With this errors I will have any problem if I need to migrate flarum or other of their extensions?
For other hand... I updated but I still can't access to the pages without the number on slug
When I tryed to access without "3-" now there is not a 404 error page like before but now there is a loading gif and this message: "The requested resource was not found".