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
cff.duplicateFirstGlyph();
          var compiler = new CFFCompiler(cff);
          tables["CFF "].data = compiler.compile();
        } catch (e) {
          warn("Failed to compile font " + properties.loadedName);
        }
      }
      
      if (!tables.name) {
        tables.name = {
          tag: "name",
          data: createNameTable(this.name),
        };
      } else {
        
        var namePrototype = readNameTable(tables.name);
        tables.name.data = createNameTable(name, namePrototype);
      }
      var builder = new OpenTypeFileBuilder(header.version);
      for (var tableTag in tables) {
        builder.addTable(tableTag, tables[tableTag].data);
      }
      return builder.toArray();
    },
    convert: function Font_convert(fontName, font, properties) {
      
      properties.fixedPitch = false;
      if (properties.builtInEncoding) {