Completing recurring task destroys recurrance.

[meichthys]

Steps to reproduce

1. Sync Nextcloud Tasks with third party client (Like Thunderbird, Tasks,org, iOS Reminders, etc)
2. Create recurring task on third party client and sync
3. From Nextcloud tasks, complete the task

Expected behavior

Task should be re-generated for next expected recurrence.

Actual behavior

The task is marked as complete and the recurrence is destroyed. The task on the third-party client is removed (only the completed tasks remain).

Server configuration

Operating system: Ubunto 22.04

Web server: Apache

Database: Postgress

**PHP version:**8.1

Nextcloud version: (see Nextcloud admin page) 26

Tasks version: v 0.15.0

Updated from an older Nextcloud or fresh install: Fresh

Signing status: No errors have been found.

List of activated apps:

Calendar, Tasks

Client configuration

Browser: Firefox

CalDAV-clients: Thunderbird, CalDavsynchronizer (outlook), Tasks.org (android), iOS Reminders, etc

[meichthys]

This issue tracks the destructive nature of completing a recurring task via the UI.
The Feature request for full recurring task support is tracked in #34