[Bug]: Files tagged with public systemtags not shown in tag file view when groupfolder has Advanced Permissions (ACL) enabled

[juliu1902]

⚠️ 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

When a team folder has Advanced Permissions (ACL) enabled, files inside this folder that are tagged with a public tag do not appear in the files tag view (/apps/files/tags). The tag itself is visible in the tag list, but the file list is empty and says "no tags found". Searching for files that have this specific tag is not possible, it also redirects to the "no tags found" page.

The same folder without Advanced Permissions enabled works correctly. As soon as I disable the Advanced Permission function, all tagged files appear in the tag view.

Steps to reproduce

1. Create a new team folder with Advanced Permissions enabled
2. Upload one or more files into it
3. Assign a tag to those files
4. Go to apps/files/tags and select that tag
5. Observe: no files are shown, even though the tag exists and it has been assigned to at least one file

Expected behavior

Files tagged with a public tag should appear in the tag file view regardless of whether the team folder has Advanced Permissions enabled, as long as the user has read access to those files.

Nextcloud Server version

33

Operating system

Debian/Ubuntu

PHP engine version

PHP 8.3

Web server

Nginx

Database engine version

PostgreSQL

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

List of activated Apps

...
teamfolders 21.0.8
collaborative tags 1.23.0
...

Nextcloud Signing status

No errors have been found.

Nextcloud Logs

Additional info

No response