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 currentKey = xref.fetchIfRef(entries[m]);
        if (key < currentKey) {
          r = m - 2;
        } else if (key > currentKey) {
          l = m + 2;
        } else {
          return xref.fetchIfRef(entries[m + 1]);
        }
      }
      
      
      info(
        `Falling back to an exhaustive search, for key "${key}", ` +
          `in "${this._type}" tree.`
      );
      for (let m = 0, mm = entries.length; m < mm; m += 2) {
        const currentKey = xref.fetchIfRef(entries[m]);
        if (currentKey === key) {
          warn(
            `The "${key}" key was found at an incorrect, ` +
              `i.e. out-of-order, position in "${this._type}" tree.`
          );
          return xref.fetchIfRef(entries[m + 1]);
        }
      }
    }
    return null;
  }
}
class NameTree extends NameOrNumberTree {