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):

if (currentNode && !pageKidsCountCache.has(currentNode)) {
                  pageKidsCountCache.put(currentNode, 1);
                }
                capability.resolve([obj, currentNode]);
              } else {
                currentPageIndex++;
                next();
              }
              return;
            }
            nodesToVisit.push(obj);
            next();
          }, capability.reject);
          return;
        }
        
        if (!isDict(currentNode)) {
          capability.reject(
            new FormatError(
              "Page dictionary kid reference points to wrong type of object."
            )
          );
          return;
        }
        count = currentNode.get("Count");
        if (Number.isInteger(count) && count >= 0) {