Hidden task still visible in embedded calendar

Steps to reproduce

1. Have a Nextcloud calendar supporting tasks
2. Create a new task with a due date
3. Set that task to don't display when shared
   
4. Embed that calendar to a website like the following example:
   <iframe src="https://mynextcloud.example.com/apps/calendar/embed/crypticcode123/listMonth/now"></iframe>

Expected behavior

A task that is set not to be displayed when shared should not be displayed publicly when the calendar is shared (via embedding).

Actual behaviour

The task will be displayed publicly in that calendar on that website.

Calendar app version

3.4.0

CalDAV-clients used

no client

Browser

Firefox 102.0.1

Client operating system

Windows 10

Server operating system

No response

Web server

No response

Database engine version

No response

PHP engine version

No response

Nextcloud version

23.0.6

Updated from an older installed version or fresh install

No response

List of activated apps

* calendar
* tasks
* contacts
* group folders
* TOTP

Nextcloud configuration

No response

Web server error log

No response

Log file

No response

Browser log

No response

Additional info

This is a managed Nextcloud instance, managed by hosting.de. Therefore I do not have access to server versions, logs, etc..

Reproduce the embedded-calendar case described in the issue, using a task marked not to display when shared. Trace the embedded calendar and task-sharing handling, then verify that the task is absent from the public embed while other calendar content remains visible.