Appointments+ appointment showing in shopping cart widget

Appointments+ free appointment showing in Shopping Cart widget when Payments Required is set to NO in Appointments+

To reproduce:
Add an appointment
Go to a stor epage and view the shopping cart
The appointment shows up there - clicking it shows a 404 error

Since Payment required is set to NO in Appointments+, the appointment should not go into the shopping cart at all! There are no appointment products set up in Marketpress.
I'm granting support access now.