Threading not working on new messages

[lukas-remis]

Steps to reproduce

1. Send message to NextCloud Mail configured mailbox
2. Reply from NextCloud
3. Reply to the reply
4. The latest reply received in NextCloud is not merged with the first one, as a thread. It will be after several minutes and couple refreshes of the Mail page

Expected behavior

New mails should be automatically displayed in a thread

Actual behavior

New mail are displayed as separate messages, even though they are part of a "conversation"

Mail app version

5.6.0

Nextcloud version

32.0.2

Mailserver or service

External

Operating system

Ubuntu 24.04

PHP engine version

None

Nextcloud memory caching

No response

Web server

None

Database

None

Additional info

No response

[kesselb]

Thanks for reporting 👍

I'm able to replicate.