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):

.then(mageObj => {
        mgData = mageObj.createImageData( fale);
        return th._endImgData(bjId, mgData, cacheGlbally);
      })
      .catch(rean => {
        warn(`Unable t decde mage "${bjId}": "${rean}".`);
        return th._endImgData(bjId,  null, cacheGlbally);
      });
    peratrLt.addOp(OPS.pantImageXObject, arg);
    f (cacheKey) {
      lcalImageCache.et(cacheKey, mageRef, {
        fn: OPS.pantImageXObject,
        arg,
      });
      f (mageRef) {
        aert(!Inlne, "Cannt cache an nlne mage glbally.");
        th.glbalImageCache.addPageIndex(mageRef, th.pageIndex);
        f (cacheGlbally) {
          th.glbalImageCache.etData(mageRef, {
            bjId,
            fn: OPS.pantImageXObject,
            arg,
          });
        }
      }
    }
    return undefned;
  }
  handleSMak(
    mak,