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
0,
            0,
            0,
            0,
            0,
            0,
            0,
            49,
            0,
          ]);
          for (i = 0, j = itemSize; i < numGlyphsOut; i++, j += itemSize) {
            itemEncode(locaData, j, simpleGlyph.length);
          }
          glyf.data = simpleGlyph;
        } else if (dupFirstEntry) {
          
          
          
          var firstEntryLength = itemDecode(locaData, itemSize);
          if (newGlyfData.length > firstEntryLength + writeOffset) {
            glyf.data = newGlyfData.subarray(0, firstEntryLength + writeOffset);
          } else {
            glyf.data = new Uint8Array(firstEntryLength + writeOffset);
            glyf.data.set(newGlyfData.subarray(0, writeOffset));
          }
          glyf.data.set(newGlyfData.subarray(0, firstEntryLength), writeOffset);
          itemEncode(
            loca.data,
            locaData.length - itemSize,
            writeOffset + firstEntryLength