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
var accentOffset = {
            x: seac[0] * matrix[0] + seac[1] * matrix[2] + matrix[4],
            y: seac[0] * matrix[1] + seac[1] * matrix[3] + matrix[5],
          };
          var charCodes = getCharCodes(mapping, glyphId);
          if (!charCodes) {
            
            
            continue;
          }
          for (let i = 0, ii = charCodes.length; i < ii; i++) {
            var charCode = charCodes[i];
            
            
            var charCodeToGlyphId = newMapping.charCodeToGlyphId;
            var baseFontCharCode = createCharCode(
              charCodeToGlyphId,
              baseGlyphId
            );
            var accentFontCharCode = createCharCode(
              charCodeToGlyphId,
              accentGlyphId
            );
            seacMap[charCode] = {
              baseFontCharCode,
              accentFontCharCode,
              accentOffset,
            };
          }
        }