Appointments form does not react on blocked timeslot in either Destination calender or the 'control for conflicts calendar

[nicoletflr]

Steps to reproduce

1. Go to appointment page in Appointment app 2.Define Destination calendar
2. Define 'Control for conflicts' calendar
3. add an appointment in 'control for conflicts' calendar
4. Go to form as a user and fill in form.
5. Select day of the appointment from step 4, see if the timeslot is blocked
6. Timeslot is still available!
7. add an appointment in Destination calendar
8. Go to form as a user and fill in form.
9. Select day of the appointment from step 8, see if the timeslot is blocked
10. Time slot is still available!

Expected behavior When a timeslot is filled in with an appointment either in the Destination calendar or the Control for conflicts calendar, than the timeslot should not be available in the form.

Actual behaviour When a timeslot is filled in with an appointment either in the Destination calendar or the Control for conflicts calendar, than the timeslot is still available in the form

Appointments app version: 2.18 calendars used: Nextcloud calendar 4.7.16 Nextcloud version 27.1.10 enterprise