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)

}
  if (task._enhanceTextSelection && textDivProperties.hasText) {
    let angleCos = 1,
      angleSin = 0;
    if (angle !== 0) {
      angleCos = Math.cos(angle);
      angleSin = Math.sin(angle);
    }
    const divWidth =
      (style.vertical ? geom.height : geom.width) * task._viewport.scale;
    const divHeight = fontHeight;
    let m, b;
    if (angle !== 0) {
      m = [angleCos, angleSin, -angleSin, angleCos, left, top];
      b = Util.getAxialAlignedBoundingBox([0, 0, divWidth, divHeight], m);
    } else {
      b = [left, top, left + divWidth, top + divHeight];
    }
    task._bounds.push({
      left: b[0],
      top: b[1],
      right: b[2],
      bottom: b[3],
      div: textDiv,
      size: [divWidth, divHeight],
      m,
    });
  }
}
function render(task) {