Group filter incorrectly applies to "My appointments"

In a Scheduler in "Visible Groups" mode, the group filter box is applied incorrectly to the "My appointments" tab. Namely, the "My appointments" tab should show all appointments of the current teacher. However, if the filter is set (e.g. via the "All appointments" tab) to a group that the teacher is not a member of, then no appointments are being displayed in "My appointments".