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)

while (node) {
    if (!node.traversal || node[$tabIndex]) {
      return;
    }
    let next = null;
    for (const child of node.traversal[$getChildren]()) {
      if (child.operation === "next") {
        next = child;
        break;
      }
    }
    if (!next || !next.ref) {
      return;
    }
    const root = node[$getTemplateRoot]();
    node[$tabIndex] = ++root[$tabIndex];
    const ref = root[$searchNode](next.ref, node);
    if (!ref) {
      return;
    }
    node = ref[0];
  }
}
function valueToHtml(value) {