Attach (recommended) or Link to PDF file here:
https://www.placementsmondiauxsunlife.com/content/dam/sunlife/regional/canada/documents/slgi/4839-I-F.pdf

Configuration:

- Web browser and its version: 91.0a1 (2021-07-03) (64-bit)
- Operating system and its version: Windows 10

Steps to reproduce the problem:
1. enableXfa = true
2. Open form

What is the expected behavior? (add screenshot)

![image](https://user-images.githubusercontent.com/7104454/124389449-1ede2b80-dcb5-11eb-98ba-01e1f3d6c6f5.png)


What went wrong? (add screenshot)

![image](https://user-images.githubusercontent.com/7104454/124389460-2c93b100-dcb5-11eb-9768-98ddd2c8f1e7.png)

startIndex = 0;
        if (leader) {
          htmlContentAreas[i].children.push(leader[$toHTML](space).html);
          leader = null;
        }
        if (trailer) {
          htmlContentAreas[i].children.push(trailer[$toHTML](space).html);
          trailer = null;
        }
        const html = root[$toHTML](space);
        if (html.success) {
          if (html.html) {
            hasSomething =
              hasSomething ||
              (html.html.children && html.html.children.length !== 0);
            htmlContentAreas[i].children.push(html.html);
          } else if (!hasSomething) {
            mainHtml.children.pop();
          }
          return mainHtml;
        }
        if (html.isBreak()) {
          const node = html.breakNode;
          flush(i);
          if (node.targetType === "auto") {
            continue;
          }
          if (node.leader) {
            leader = this[$searchNode](node.leader, node[$getParent]());
            leader = leader ? leader[0] : null;