Custom Libraries in Confluence Cloud and Server can't be set by default

Preflight Checklist

• I agree to follow the Code of Conduct that this project adheres to.
• I have searched the issue tracker for a feature request that matches the one I want to file, without success.

Describe the bug
The blog post https://drawio-app.com/customise-default-shape-libraries-templates-and-plugins-in-draw-io-for-confluence-cloud/ says that users can have default libraries when they open the editor. They should also be able to have custom libraries available per default, what is important for customers that like to offer customized shapes to their users.

The default library display is possible in both deployments, but we don't manage it to make it happen for custom libraries

To Reproduce
Steps to reproduce the behavior:

1. Create a custom library
2. add the name of the library to the JSON code

{ "defaultLibraries": "general;uml;entity;",
"defaultCustomLibraries": ["marketing", "infographics"], }

3. Library will not be displayed in the library panel of the editor.
   

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
If applicable, add screenshots to help explain your problem.

draw.io version (In the Help->About menu of the draw.io editor):

• 9.4.10 (Confluence Server 6.13)
• Confluence Cloud