Tried looking in the Moodle Tracker but couldn't find anything relevant to this.
If you click on Reports > Detailed statistics within a lesson, there's a dropdown with 'Filter by group'. However, selecting different group does not change the 'detailed report', answers from ALL groups (even those the viewing teacher is not part of) are shown.
Is this supposed to work this way, or is it supposed to filter the detailed answers by group?
Reports > Overview within the lesson works fine filtering by group.