Backgrounds not rendered

[kwisatz]

Attach (recommended) or Link to PDF file here:
CAE.pdf

Configuration:

• Web browser and its version: Chromium 103 using https://mozilla.github.io/pdf.js/web/viewer.html
• Operating system and its version: Debian 11.3
• PDF.js version:

   exports.version = version;
   const build = 'e6fe12743';
   exports.build = build;

• Is a browser extension: No

Steps to reproduce the problem:

1. Go to https://mozilla.github.io/pdf.js/web/viewer.html
2. Open the file attached

What is the expected behavior?

Boxes should render opaque colors over page background.

What went wrong?

Box backgrounds are transparent