PDF colour management broken

⚠️ 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 (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 you have a PDF that has different color profile than sRGB (ie Adobe 1998), then the PDF viewer will display colours incorrectly.

When uploading the same doc to Google Drive, or any other pgoram the colours render correctly

Steps to reproduce

1. Produce document with adobe 1998 color profile
2. compare to other programs to when opening in nextcloud pdf viewer

Expected behavior

colours should be correct

Installation method

No response

Operating system

No response

PHP engine version

No response

Web server

No response

Database engine version

No response

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

No response

Are you using the Nextcloud Server Encryption module?

No response

What user-backends are you using?

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

Configuration report

No response

List of activated Apps

I don't know how to do this

Nextcloud Signing status

No response

Nextcloud Logs

No response

Additional info

No response

Start by reproducing the problem in the Nextcloud PDF viewer with a PDF using the Adobe 1998 color profile, then compare its rendering with another program. Trace the viewer's rendering path and verify that the displayed colors match the reference rendering when the fix is complete.