[Bug]: Restoring calendar event from trashbin does not trigger event notification

⚠️ This issue respects the following points: ⚠️

• This is a bug, not a question or a configuration/webserver/proxy issue.
• This issue is not already reported on Github OR Nextcloud Community Forum (I've searched it).
• Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
• I agree to follow Nextcloud's Code of Conduct.

Bug description

After removing a calendar event, a canceled notification is sent to event participants, and the event is moved into the trashbin of the calendar. Now, when restoring the same calendar event from the trashbin, no notification is send to event participants. Imo, this is a bug and a new calendar notification (similar to a new event) should be send out.

Steps to reproduce

1. Create calendar event with participant
2. Remove calendar event from calendar (triggers canceled notification)
3. Restore same calendar event from trashbin (does not trigger new notification)

Expected behavior

After restoring a calendar event from the trashbin, a new notification should be sent out.

Installation method

Community Docker image

Nextcloud Server version

27

Operating system

Debian/Ubuntu

PHP engine version

None

Web server

Nginx

Database engine version

MariaDB

Is this bug present after an update or on a fresh install?

None

Are you using the Nextcloud Server Encryption module?

None

What user-backends are you using?

• Default user-backend (database)
• LDAP/ Active Directory
• SSO - SAML
• Other

Configuration report

No response

List of activated Apps

No response

Nextcloud Signing status

No response

Nextcloud Logs

No response

Additional info

No response

No files or tests are named. Start by reproducing the three calendar-event steps in Nextcloud Server 27, then trace the trashbin restore path and the existing canceled-event notification flow. Done means restoring an event sends participants a new notification comparable to the notification for a new event.