Attach (recommended) or Link to PDF file here:
[test.pdf](https://github.com/mozilla/pdf.js/files/6715502/test.pdf)

Configuration:
- Web browser and its version: Google Chrome Version 91.0.4472.114 
- Operating system and its version: Windows 10 Enterprise
- PDF.js version: 
- Is a browser extension: yes

Steps to reproduce the problem:
1. download file
2. open file



What is the expected behavior? (add screenshot)
show symbol
![image](https://user-images.githubusercontent.com/50500976/123409847-55ca8800-d5b7-11eb-9e5b-c7f3b33c00e1.png)

What went wrong? (add screenshot)
Does not show symbol
![image](https://user-images.githubusercontent.com/50500976/123409707-274cad00-d5b7-11eb-9a64-b11dcf3cdc3f.png)
Link to a viewer (if hosted on a site other than mozilla.github.io/pdf.js or as Firefox/Chrome extension): Latest Version Chrome extension

originalCharCode,
    fontChar,
    unicode,
    accent,
    width,
    vmetric,
    operatorListId,
    isSpace,
    isInFont
  ) {
    return (
      this.originalCharCode === originalCharCode &&
      this.fontChar === fontChar &&
      this.unicode === unicode &&
      this.accent === accent &&
      this.width === width &&
      this.vmetric === vmetric &&
      this.operatorListId === operatorListId &&
      this.isSpace === isSpace &&
      this.isInFont === isInFont
    );
  }
}
function int16(b0, b1) {
  return (b0 << 8) + b1;
}
function writeSignedInt16(bytes, index, value) {