[Bug]: Chat messages are not visible until the "Join conversation" button is pressed.

⚠️ This issue respects the following points: ⚠️

• This is a bug, not a question or a configuration/webserver/proxy issue.
• This issue is not already reported on Github OR Nextcloud Community Forum (I've searched it).
• Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
• I agree to follow Nextcloud's Code of Conduct.

Bug description

If a comment is made on a file/image that is shared with another person there is no way for either of them to know unless they open the side bar go to the Chat tab and select the "Join conversation" button.

In the image below a comment is made on a photo that is shared with them. When refreshing the page of the source file no comment is visible until the join conversation button is pressed.

Steps to reproduce

1. Share a file.
2. Open shared file and make a comment.
3. Reference original shared files Chat tab in the side panel and see that no comments are visible.

Expected behavior

when a comment is made on file it is automatically visible to everyone that has access to it. Additionally an indication that there is a comment should be easily visible on the screen even when the side panel is closed so that individuals are aware that comments have been made. Maybe a little chat bubble that when pressed pulls open the sidebar with the Chat tab selected.

Installation method

Community Docker image

Nextcloud Server version

28

Operating system

Debian/Ubuntu

PHP engine version

PHP 8.2

Web server

Nginx

Database engine version

MariaDB

Is this bug present after an update or on a fresh install?

None

Are you using the Nextcloud Server Encryption module?

Encryption is Disabled

What user-backends are you using?

• Default user-backend (database)
• LDAP/ Active Directory
• SSO - SAML
• Other

Configuration report

No response

List of activated Apps

No response

Nextcloud Signing status

No errors have been found.

Nextcloud Logs

No response

Additional info

No response

Start with the file sidebar's Chat tab and the "Join conversation" flow described in the reproduction steps; no source file or test is named. Done means comments are visible to users with access without pressing the button, with a clear indication when comments exist while the sidebar is closed.