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)

div.style.padding = paddingBuf.join(" ");
        if (transformBuf.length) {
          div.style.transform = transformBuf.join(" ");
        }
      } else {
        div.style.padding = null;
        div.style.transform = divProps.originalTransform;
      }
    }
  }
}
/**
 * @param {TextLayerRenderParameters} renderParameters
 * @returns {TextLayerRenderTask}
 */
function renderTextLayer(renderParameters) {
  const task = new TextLayerRenderTask({
    textContent: renderParameters.textContent,
    textContentStream: renderParameters.textContentStream,
    container: renderParameters.container,
    viewport: renderParameters.viewport,
    textDivs: renderParameters.textDivs,
    textContentItemsStr: renderParameters.textContentItemsStr,
    enhanceTextSelection: renderParameters.enhanceTextSelection,
  });
  task._render(renderParameters.timeout);
  return task;
}
export { renderTextLayer };