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)

});
    it(
      "should fetch document info and page, without range, " +
        "using complete initialData",
      async function () {
        let fetches = 0;
        const data = await dataPromise;
        const transport = new PDFDataRangeTransport(
          data.length,
          data,
           true
        );
        transport.requestDataRange = function (begin, end) {
          fetches++;
        };
        const loadingTask = getDocument({
          disableRange: true,
          range: transport,
        });
        const pdfDocument = await loadingTask.promise;
        expect(pdfDocument.numPages).toEqual(14);
        const pdfPage = await pdfDocument.getPage(10);
        expect(pdfPage.rotate).toEqual(0);
        expect(fetches).toEqual(0);
        await loadingTask.destroy();
      }
    );
  });
});