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)

return this[$extra].space || { width: 0, height: 0 };
  }
  [$toHTML]() {
    
    if (!this[$extra]) {
      this[$extra] = {
        numberOfUse: 1,
      };
    }
    const children = [];
    this[$extra].children = children;
    const style = Object.create(null);
    if (this.medium && this.medium.short && this.medium.long) {
      style.width = measureToString(this.medium.short);
      style.height = measureToString(this.medium.long);
      this[$extra].space = {
        width: this.medium.short,
        height: this.medium.long,
      };
      if (this.medium.orientation === "landscape") {
        const x = style.width;
        style.width = style.height;
        style.height = x;
        this[$extra].space = {