Moving email conversations sometimes necessary several times

Steps to reproduce

1. An email conversation with multiple replies
2. Click on "move conversation" (DE: Unterhaltung verschieben)
3. Select a folder in your mailbox

Expected behavior

The entire conversation is moved to the selected folder.

Actual behavior

After moving the conversation, you will receive a notification that a new email has arrived. Then, without reloading the page, an email within this mail conversation will reappear in your mailbox inbox. This can happen several times, depending on the size of the conversation.

You then have to manually move this “new” unmoved email/email conversation to the desired folder and repeat this until it is actually moved and does not reappear in your inbox after moving.

This doesn't happen all the time, just now and then. I have no idea what could be causing it. I can't see any error messages or anything like that in the logs.

Mail app version

5.6.10

Nextcloud version

32.0.3

Mailserver or service

No response

Operating system

No response

PHP engine version

PHP 8.3

Nextcloud memory caching

No response

Web server

None

Database

None

Additional info

No response

Reproduce the issue in the Nextcloud Mail app using a conversation with multiple replies and the reported move-conversation steps. Start by tracing the move and subsequent new-mail notification behavior, then verify that the entire conversation remains in the selected folder without reappearing in the inbox or requiring repeated moves.