Synchronizing completed tasks from Thunderbird to Nextcloud via CalDAV is not possible

[myssv]

Steps to reproduce

1. Add a Task in Thunderbird
2. Sync with Nextcloud
3. Mark Task as completed

Expected behavior

Task should also be in Nextcloud shown as completed

Actual behaviour

Tasks stay as uncompleted

Tasks app version

0.17.1

CalDAV-clients used

Thunderbird 140.9

Browser

FireFox 149.0

Client operating system

Windows 11

Server operating system

Hetzner Storage Share

Web server

None

Database engine version

None

PHP engine version

None

Nextcloud version

32.0.6

Updated from an older installed version or fresh install

None

List of activated apps

Activity 	5.0.0 	
Brute-force settings 	5.0.0 	
Calendar 	6.2.1 	
Client Push 	1.3.0 		
Collaborative tags 	1.22.0 	
Comments 	1.22.0 	
Contacts 	8.3.6 	
Contacts Interaction 	1.13.1 	
Dashboard 	7.12.0 	
Deleted files 	1.22.0 	
Federation 	1.22.0 	
File reminders 	1.5.0 	
File sharing 	1.24.1 	
Files download limit 	5.0.0-dev.0 	
First run wizard 	5.0.0 	
Monitoring 	4.0.0 	
Nextcloud announcements 	4.0.0 	
Nextcloud webhook support 	1.3.0 	
Notifications 	5.0.0 	
PDF viewer 	5.0.0 	
Password policy 	4.0.0 	
Photos 	5.0.0 	
Privacy 	4.0.0 	
Recommendations 	5.0.0 	
Related Resources 	3.0.0 	
Share by mail 	1.22.0 	
Support 	4.0.0 	
Tasks 	0.17.1 	
Teams 	32.0.0 	
Text 	6.0.1 	
Two-Factor TOTP Provider 	14.0.0 	
Update notification 	1.22.0 	
User status 	1.12.0 	
Versions 	1.25.0 	
Weather status 1.12.0

Nextcloud configuration

Hetzner Storage Share, no access

Web server error log

Hetzner Storage Share, no access

Log file

Hetzner Storage Share, no access

Browser log

Additional info

No response