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)

if (!node[$extra]) {
    return null;
  }
  const attributes = node[$extra].attributes;
  const html = {
    name: "div",
    attributes,
    children: node[$extra].children,
  };
  if (node[$extra].failingNode) {
    const htmlFromFailing = node[$extra].failingNode[$flushHTML]();
    if (htmlFromFailing) {
      html.children.push(htmlFromFailing);
    }
  }
  if (html.children.length === 0) {
    return null;
  }
  node[$extra].children = [];
  delete node[$extra].line;
  node[$extra].numberInLine = 0;
  return html;
}
function addHTML(node, html, bbox) {