Attach (recommended) or Link to PDF file here:
http://education.ohio.gov/getattachment/Topics/Special-Education/Preschool-Special-Education/ETR-Preschool-Planning-Form.pdf.aspx

- Web browser and its version: Firefox 89.0.1
- Operating system and its version: Windows 10 10.0.19043.1052
- PDF.js version: commit 5d251a3a3e7bfaa8fbfa07f0b7f9901eb3f999d9
- Is a browser extension: No

Steps to reproduce the problem:
1. Enable XFA support
2. Open form

What is the expected behavior? (add screenshot)
Shapes stay inside table cells
![image](https://user-images.githubusercontent.com/7104454/122572782-1252a580-d01c-11eb-9d0f-5fed46d6f2fe.png)

What went wrong? (add screenshot)
Shapes fall outside cells (among other issues)
![image](https://user-images.githubusercontent.com/7104454/122572885-2d251a00-d01c-11eb-8863-fa3b9969f0ea.png)

return true;
  }
  [$hasSettableValue]() {
    return true;
  }
  [$setValue](value) {
    for (const field of this.field.children) {
      if (!field.value) {
        const nodeValue = new Value({});
        field[$appendChild](nodeValue);
        field.value = nodeValue;
      }
      field.value[$setValue](value);
    }
  }
  [$isThereMoreWidth]() {
    return (
      (this.layout.endsWith("-tb") &&
        this[$extra].attempt === 0 &&
        this[$extra].numberInLine > 0) ||
      this[$getParent]()[$isThereMoreWidth]()
    );
  }
  [$isSplittable]() {