Appointments+ not sending email notification when appointment manually removed

Appointments+ is no longer sending an email notification to the person that booked an appointment when the appointment status is manually set to 'Removed'. I have verified that the setting for 'Send notification email on appointment removal' is set to 'Yes'. This worked fine in the past but stopped working.

No entries are being made in the log when the appointment status is changed to 'Removed' as well. I have confirmed that the 'Log Sent email Records' setting is enabled. This also worked in the past on the same system.