Attach (recommended) or Link to PDF file here:
test1.pdf

Configuration:

• Web browser and its version: FireFox 88.0
• Operating system and its version: macOS 10.15.7
• PDF.js version: 2.8.243
• Is a browser extension: No

Steps to reproduce the problem:

1. Open the PDF with pdf.js.
   2.Found the text of this PDF disappeared.

What is the expected behavior? (add screenshot)

What went wrong? (add screenshot)

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