Students can skip date-based access restrictions with URLs

If one teacher configures sections to be available in a specific date, students shouldn’t be able to see them until that date, neither to join them if they are joinable.

We have found that students can skip the date restrictions, view the sections and even join them with the same URLs they use when there are not restrictions.

This issue is present in Sakai 22 using a redirection and in master is even easier, using the same jsf URL.