Attach (recommended) or Link to PDF file here:
[test.pdf](https://github.com/mozilla/pdf.js/files/6270827/test.pdf)
Configuration:
- Web browser and its version:chrome 89
- Operating system and its version:win10
- PDF.js version: 2.4/2.7/2.8 no working
- Is a browser extension: no 

What is the expected behavior? (add screenshot)
![image](https://user-images.githubusercontent.com/18545199/113852392-1ae26080-97cf-11eb-9dc9-0cecf52d267b.png)

What went wrong? (add screenshot)
![1617791294(1)](https://user-images.githubusercontent.com/18545199/113852355-10c06200-97cf-11eb-8672-598750f1093a.jpg)


console this log : **FormatError: TrueType Collection does not contain "DCWGQU+CambriaMath" font** 

any solution?thanks
fontCharCode = mapSpecialUnicodeValues(fontCharCode);
      }
      if (this.isType3Font) {
        
        operatorListId = fontCharCode;
      }
      var accent = null;
      if (this.seacMap && this.seacMap[charcode]) {
        isInFont = true;
        var seac = this.seacMap[charcode];
        fontCharCode = seac.baseFontCharCode;
        accent = {
          fontChar: String.fromCodePoint(seac.accentFontCharCode),
          offset: seac.accentOffset,
        };
      }
      let fontChar = "";
      if (typeof fontCharCode === "number") {
        if (fontCharCode <= 0x10ffff) {
          fontChar = String.fromCodePoint(fontCharCode);
        } else {
          warn(`charToGlyph - invalid fontCharCode: ${fontCharCode}`);
        }
      }
      var glyph = this.glyphCache[charcode];
      if (
        !glyph ||
        !glyph.matchesForCache(
          fontChar,
          unicode,