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):

return (
      value instanceof Ref ||
      value instanceof Dict ||
      Array.isArray(value) ||
      isStream(value)
    );
  }
  function addChildren(node, nodesToVisit) {
    if (node instanceof Dict) {
      node = node.getRawValues();
    } else if (isStream(node)) {
      node = node.dict.getRawValues();
    } else if (!Array.isArray(node)) {
      return;
    }
    for (const rawValue of node) {
      if (mayHaveChildren(rawValue)) {
        nodesToVisit.push(rawValue);
      }
    }
  }
  
  function ObjectLoader(dict, keys, xref) {
    this.dict = dict;
    this.keys = keys;
    this.xref = xref;
    this.refSet = null;
  }
  ObjectLoader.prototype = {
    async load() {