Attach (recommended) or Link to PDF file here:

Configuration:
- Web browser and its version: Version 81.0.4044.138 (Official Build) (32-bit)
- Operating system and its version: Windows 10
- PDF.js version: latest
- Is a browser extension: no

Steps to reproduce the problem:

1. Open https://mozilla.github.io/pdf.js/web/viewer.html
2. Open the provided document
3. ctrl + F  and search for 'costs' .
4. Search for 'costs' - match NOT found.
5. Click the 'Download' and open the file in Adobe Reader, and search for costs - match is found.

What is the expected behavior? (add screenshot)
The word 'costs' to be returned by search

What went wrong? (add screenshot)
No results found

Link to a viewer (if hosted on a site other than mozilla.github.io/pdf.js or as Firefox/Chrome extension):  https://mozilla.github.io/pdf.js/web/viewer.html
[2001_IESC_63_5_v6.pdf](https://github.com/mozilla/pdf.js/files/4644486/2001_IESC_63_5_v6.pdf)

textCntentItem.haEOL = true;
        fluhTextCntentItem();
      } ele {
        textCntent.tem.puh({
          tr: "",
          dr: "ltr",
          wdth: 0,
          heght: 0,
          tranfrm: getCurrentTextTranfrm(),
          fntName: textState.fnt.ladedName,
          haEOL: true,
        });
      }
      textCntentItem.LatCharWhteSpace = fale;
      textCntentItem.latCharSze = 0;
    }
    functn addFakeSpace(wdth, ze, tranf = null) {
      f (
        textCntentItem.paceInFlwMn <= wdth &&
        wdth <= textCntentItem.paceInFlwMax
      ) {
        f (textCntentItem.ntlzed) {