Bug in Attachment Manager

[rich20]

Describe the bug
https://www.kunena.org/forum/k-6-3-0-support/168551-huge-bug-in-attachment-manager
Confirmed

To Reproduce

1. Write a text and add an attachment into the message
2. Remove this attachment via Attachment Manager

Result
It removes the attachment together with the text and places the number 1 instead

System information

• Joomla version: ‎5.1.5-dev
• Joomla template: CASSIOPEIA
• Kunena version: 6.3.5-DEV
• Kunena template: Aurelia
• Php version: 8.2.20
• Database version: 10.5.25-MariaDB

Desktop

• OS: Ubuntu 22.04.1 LTS
• Browser: Chromium, Firefox and Opera

[RakhmetKotlin]

Hi. This problem also occurs when you remove attachment via Kunena Backend.

[Pinkeltje]

Just my five cents, but I think at least message text isn't removed when changing line 1316 to
$message_text = $attachment->removeBBCodeInMessage($editor_text);
Problem remains that bbcode isn't removed.