[Bug]: Reminder does not work when inviting people

⚠️ 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

In Nextcloud 32.0.7 the invitation does not use the default reminder when adding attendees. Without attendees it works fine. The ThunderBird client gets the meeting, but has no reminder for the organizer and attendees.

Steps to reproduce

1. Create an appointment with attendees, keep the default reminder. No reminder in ThunderBird.
2. Create an appointment without attendees, keep the default reminder. A reminder in Thunderbird.

Expected behavior

When inviting people, the default reminder should be respected and used.

Nextcloud Server version

32

Operating system

Debian/Ubuntu

PHP engine version

PHP 8.3

Web server

Apache (supported)

Database engine version

PostgreSQL

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

Updated from a MINOR version (ex. 32.0.1 to 32.0.2)

Are you using the Nextcloud Server Encryption module?

Encryption is Enabled

What user-backends are you using?

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

Configuration report

List of activated Apps

Nextcloud Signing status

Nextcloud Logs

Additional info

No response

No source file or test is named. Reproduce the behavior in Nextcloud 32.0.7 with Thunderbird, comparing appointments with and without attendees and checking the generated reminder data; done means the default reminder is present for the organizer and attendees when people are invited.