Appointments: Public booking page not found when logged in and Calendar app "Limit to groups" enabled

Steps to reproduce

1. Create an Appointment Schedule and copy the link to the booking page.
2. Limit access to the Calendar app to a group fooBar in /settings/apps/enabled/calendar
3. Log in as a user who is not in the fooBar group - hence has no access to the calendar app
4. Try opening the public link to the Appointment Schedule and see how it says "Page not found".

5. Open an incognito browser window and open the same link in there. See how there is no error.

Expected behavior

The public link to an Appointment Schedule should always work, no matter if you are logged in or not.

Actual behavior

The public link is not working for logged-in users who are in restricted groups.

Calendar app version

5.5.14

CalDAV-clients used

No response

Browser

No response

Client operating system

No response

Server operating system

No response

Web server

None

Database engine version

None

PHP engine version

None

Nextcloud version

31.0.14

Updated from an older installed version or fresh install

None

List of activated apps

Nextcloud configuration

Web server error log

Log file

Browser log

Additional info

No response

No file or test is named in the report. Start by reproducing the public Appointment Schedule link with Calendar access limited to a group, comparing a logged-in excluded user with an incognito window. Done means the public link works in both cases, including for logged-in users without Calendar app access.