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 (expandDivs) {
        transformBuf.length = 0;
        paddingBuf.length = 0;
        if (divProps.originalTransform) {
          transformBuf.push(divProps.originalTransform);
        }
        if (divProps.paddingTop > 0) {
          paddingBuf.push(`${divProps.paddingTop}px`);
          transformBuf.push(`translateY(${-divProps.paddingTop}px)`);
        } else {
          paddingBuf.push(0);
        }
        if (divProps.paddingRight > 0) {
          paddingBuf.push(`${divProps.paddingRight / divProps.scale}px`);
        } else {
          paddingBuf.push(0);
        }
        if (divProps.paddingBottom > 0) {
          paddingBuf.push(`${divProps.paddingBottom}px`);
        } else {
          paddingBuf.push(0);
        }
        if (divProps.paddingLeft > 0) {
          paddingBuf.push(`${divProps.paddingLeft / divProps.scale}px`);
          transformBuf.push(
            `translateX(${-divProps.paddingLeft / divProps.scale}px)`
          );
        } else {
          paddingBuf.push(0);
        }