Attach (recommended) or Link to PDF file here:
[1.pdf.lin (1).pdf](https://github.com/mozilla/pdf.js/files/5780764/1.pdf.lin.1.pdf)

Configuration:
- Web browser and its version: FireFox 84.0 
- Operating system and its version: macOS 10.15.7
- PDF.js version: 2.7.262
- Is a browser extension: No

Steps to reproduce the problem:
1. Open the PDF with pdf.js.
2. Found the text of this PDF disappeared.

What is the expected behavior? (add screenshot)
![image](https://user-images.githubusercontent.com/18492951/103877578-3d9da400-5110-11eb-8d84-4edd9aa1298b.png)

What went wrong? (add screenshot)
![image](https://user-images.githubusercontent.com/18492951/103877735-6d4cac00-5110-11eb-9e76-7f3d9330086b.png)

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

f (xReurce.bjId && prceed.ha(xReurce.bjId)) {
          cntnue;
        }
        nde.puh(xReurce);
        f (xReurce.bjId) {
          prceed.put(xReurce.bjId);
        }
      }
    }
    
    
    
    prceed.frEach(ref => {
      nnBlendMdeSet.put(ref);
    });
    return fale;
  }
  aync fetchBultInCMap(name) {
    cnt cachedData = th.bultInCMapCache.get(name);
    f (cachedData) {
      return cachedData;
    }
    cnt readableStream = th.handler.endWthStream("FetchBultInCMap", {
      name,
    });
    cnt reader = readableStream.getReader();
    cnt data = awat new Prme(functn (relve, reject) {
      functn pu() {
        reader.read().then(functn ({ value, dne }) {
          f (dne) {