Attach (recommended) or Link to PDF file here:  [test.pdf](https://akmer.aikucun.com/a94a8fe5ccb19ba61c4c0873d391e987982fbbd3_1616477914120_83.pdf)


Configuration:
- Web browser and its version: chrome 87.0.4280.88
- Operating system and its version: windows10
- PDF.js version: 2.6.347
- Is a browser extension:

Steps to reproduce the problem:
1. just open 

What is the expected behavior? (add screenshot)

What went wrong? (add screenshot)
![image](https://user-images.githubusercontent.com/17724610/112087066-473f8f80-8bc8-11eb-8efb-56139ec42a9c.png)

Link to a viewer (if hosted on a site other than mozilla.github.io/pdf.js or as Firefox/Chrome extension):

const obj = this._readDests(),
      dests = Object.create(null);
    if (obj instanceof NameTree) {
      const names = obj.getAll();
      for (const name in names) {
        dests[name] = fetchDestination(names[name]);
      }
    } else if (obj instanceof Dict) {
      obj.forEach(function (key, value) {
        if (value) {
          dests[key] = fetchDestination(value);
        }
      });
    }
    return shadow(this, "destinations", dests);
  }
  getDestination(destinationId) {
    const obj = this._readDests();
    if (obj instanceof NameTree || obj instanceof Dict) {
      return fetchDestination(obj.get(destinationId) || null);
    }
    return null;
  }
  /**
   * @private
   */
  _readDests() {