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)




for (let i = 0, len = items.length; i < len; i++) {
      if (items[i].str === undefined) {
        if (
          items[i].type === "beginMarkedContentProps" ||
          items[i].type === "beginMarkedContent"
        ) {
          const parent = this._container;
          this._container = document.createElement("span");
          this._container.classList.add("markedContent");
          if (items[i].id !== null) {
            this._container.setAttribute("id", `${items[i].id}`);
          }
          parent.appendChild(this._container);
        } else if (items[i].type === "endMarkedContent") {
          this._container = this._container.parentNode;
        }
        continue;
      }
      this._textContentItemsStr.push(items[i].str);
      appendText(this, items[i], styleCache, this._layoutTextCtx);
    }
  }
  /**
   * @private
   */
  _layoutText(textDiv) {