CoursePress - Go backward in unit despite mandatory answer required

Within CoursePress, a Mandatory answer requires you to enter an answer before proceeding ahead. That makes sense, but I've noticed that if you have a Mandatory answer required, you can't go back to previous content in the unit either. You have to enter an answer before you can navigate backward.

That doesn't seem consistent with the behavior described in the authoring of the page though where it says that students need to enter an answer to "proceed", presumably to the next page in the unit.