Attach (recommended) or Link to PDF file here:
[chinese.pdf](https://github.com/mozilla/pdf.js/files/6404389/download.1.pdf)

Configuration:
- Web browser and its version:90.0.4430.93
- Operating system and its version: mac 10.15.5
- PDF.js version: 2.9.146
- Is a browser extension:no

Steps to reproduce the problem:
1. The Chinese in the attachment cannot be rendered

Brower ✅
![image](https://user-images.githubusercontent.com/13477114/116678074-81782a00-a9db-11eb-8719-74f48fcebc2b.png)

PDF.js ❌ [https://mozilla.github.io/pdf.js/web/viewer.html](https://mozilla.github.io/pdf.js/web/viewer.html)
![image](https://user-images.githubusercontent.com/13477114/116678212-a371ac80-a9db-11eb-847f-dd1ad7752c13.png)


What is the expected behavior? (add screenshot)
**The Chinese character can be rendered**
What went wrong? (add screenshot)
**All of the Chinese character cannot be rendered**
Link to a viewer (if hosted on a site other than mozilla.github.io/pdf.js or as Firefox/Chrome extension):

tables.maxp.data[5] = numGlyphsOut & 255;
    const hintsValid = sanitizeTTPrograms(
      tables.fpgm,
      tables.prep,
      tables["cvt "],
      maxFunctionDefs
    );
    if (!hintsValid) {
      delete tables.fpgm;
      delete tables.prep;
      delete tables["cvt "];
    }
    
    
    sanitizeMetrics(
      font,
      tables.hhea,
      tables.hmtx,
      tables.head,
      numGlyphsOut,
      dupFirstEntry
    );
    if (!tables.head) {
      throw new FormatError('Required "head" table is not found');
    }
    sanitizeHead(tables.head, numGlyphs, isTrueType ? tables.loca.length : 0);
    let missingGlyphs = Object.create(null);
    if (isTrueType) {
      const isGlyphLocationsLong = int16(
        tables.head.data[50],