Nextcloud mail doesnt send an accept on calendar invites

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Steps to reproduce

1. get an email with an invite from office365 calender
2. click accept.
3. it is shown as accepted in nc mail and nc calendar
4. the office 365 user does not get that it is accepted
5. go in to nc calendar and click decline and accept again
6. office365 user will firt get a decline and then an accept

Expected behavior

When clicking accept in the email it should send accepted to the remote user.

Actual behavior

Doesnt send an accept untill you manually decline and accept in the calendar

Mail app version

5.5.13

Nextcloud version

32.0.1

Mailserver or service

own dovecot

Operating system

debian 13

PHP engine version

PHP 8.3

Nextcloud memory caching

redis

Web server

Apache (supported)

Database

MariaDB

Additional info

No response

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@SebastianKrupinski