Attach (recommended) or Link to PDF file here:
[Scan-to-Mail-PDF1_(1).pdf](https://github.com/mozilla/pdf.js/files/6876708/Scan-to-Mail-PDF1_.1.pdf)

Configuration:
- Web browser and its version: Firefox Developer 91.0b7 (64-Bit)
- Operating system and its version: Windows 10 (21H1)
- PDF.js version: 2.10.339 (also tested with the online demo, Version 2.11.5)
- Is a browser extension:

Steps to reproduce the problem:
1. Open the attached pdf
2. Scroll to page 3

What is the expected behavior? (add screenshot)
![image](https://user-images.githubusercontent.com/7944797/126957487-cc7a2d19-adfb-42e4-9809-74e1a7a85048.png)

What went wrong? (add screenshot)
![image](https://user-images.githubusercontent.com/7944797/126957351-29aebb4d-eadd-4273-b69d-530b9060c12c.png)




if (!this._enhanceTextSelection || !this._renderingDone) {
      return;
    }
    if (this._bounds !== null) {
      expand(this);
      this._bounds = null;
    }
    const transformBuf = [],
      paddingBuf = [];
    for (let i = 0, ii = this._textDivs.length; i < ii; i++) {
      const div = this._textDivs[i];
      const divProps = this._textDivProperties.get(div);
      if (!divProps.hasText) {
        continue;
      }