PDF files are garbled when using Firefox built-in PDF viewer

[ArnieO]

This problem seems to have appeared in one of the latest Firefox versions, it started a few days ago.

Attach (recommended) or Link to PDF file here: https://s1.q4cdn.com/806093406/files/doc_downloads/test.pdf

Configuration:

• Web browser and its version:
  
• Operating system and its version: Windows 11
• PDF.js version: No idea, I'm using the built-in PDF viewer
• Is a browser extension: No

Steps to reproduce the problem:

1. Download the test file linked above
2. Open in Firefox

What is the expected behavior?
It should look like this (opened in Adobe Acrobat):

What went wrong? (add screenshot)
It looks like this in Firefox:

Link to a viewer (if hosted on a site other than mozilla.github.io/pdf.js or as Firefox/Chrome extension):

[Snuffleupagus]

This is, most likely, a duplicate of bug 1854090 and/or bug 1857015.

[ArnieO]

Yes, it is the same.