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)

constructor(attributes) {
    super(TEMPLATE_NS_ID, "corner",  true);
    this.id = attributes.id || "";
    this.inverted = getInteger({
      data: attributes.inverted,
      defaultValue: 0,
      validate: x => x === 1,
    });
    this.join = getStringOption(attributes.join, ["square", "round"]);
    this.presence = getStringOption(attributes.presence, [
      "visible",
      "hidden",
      "inactive",
      "invisible",
    ]);