Issue Summary

In Confluence Cloud, when a dark custom header color is configured and the site is viewed in Light mode with the sidebar expanded, the top-left navigation controls become white on a white background and are invisible.

Steps to Reproduce

1. Go to Confluence administration and open Look and feel or navigation color customization.
2. Set the header/background color to a dark color.
3. Open the site in Light mode.
4. Expand the sidebar.
5. Observe the top-left area of the page.

Expected Results

These navigation elements should remain visible with sufficient contrast regardless of the configured header color when the sidebar is expanded in Light mode.

Actual Results

The app switcher, logo, site title, and sidebar collapse control are displayed in white on a white background, making them invisible or extremely difficult to recognize.

Workaround

Change the schema color to background white

Notes

• This appears consistent with the previously reported issue in CONFCLOUD-79217, which is already closed.