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 i, j;
        const locaEntries = [];
        
        for (i = 0, j = 0; i < numGlyphs + 1; i++, j += itemSize) {
          let offset = itemDecode(locaData, j);
          if (offset > oldGlyfDataLength) {
            offset = oldGlyfDataLength;
          }
          locaEntries.push({
            index: i,
            offset,
            endOffset: 0,
          });
        }
        locaEntries.sort((a, b) => {
          return a.offset - b.offset;
        });
        
        
        
        for (i = 0; i < numGlyphs; i++) {
          locaEntries[i].endOffset = locaEntries[i + 1].offset;
        }
        
        locaEntries.sort((a, b) => {
          return a.index - b.index;
        });
        var missingGlyphs = Object.create(null);
        var writeOffset = 0;
        itemEncode(locaData, 0, writeOffset);