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)

const extra = node[$extra];
  const availableSpace = extra.availableSpace;
  const [x, y, w, h] = bbox;
  switch (node.layout) {
    case "position": {
      extra.width = Math.max(extra.width, x + w);
      extra.height = Math.max(extra.height, y + h);
      extra.children.push(html);
      break;
    }
    case "lr-tb":
    case "rl-tb":
      if (!extra.line || extra.attempt === 1) {
        extra.line = {
          name: "div",
          attributes: {