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 style = toStyle("margin");
    const size = measureToString(this.size);
    style.width = style.height = size;
    let type;
    let className;
    let groupId;
    const field = this[$getParent]()[$getParent]();
    const items =
      (field.items.children.length &&
        field.items.children[0][$toHTML]().html) ||
      [];
    const exportedValue = {
      on: (items[0] || "on").toString(),
      off: (items[1] || "off").toString(),
    };
    const value = (field.value && field.value[$text]()) || "off";
    const checked = value === exportedValue.on || undefined;
    const container = field[$getSubformParent]();
    const fieldId = field[$uid];
    let dataId;
    if (container instanceof ExclGroup) {
      groupId = container[$uid];
      type = "radio";
      className = "xfaRadio";
      dataId = container[$data] && container[$data][$uid];