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)

if (node[$extra]) {
    return false;
  }
  node[$extra] = Object.create(null);
  if (node.targetType === "auto") {
    return false;
  }
  const root = node[$getTemplateRoot]();
  let target = null;
  if (node.target) {
    target = root[$searchNode](node.target, node[$getParent]());
    if (!target) {
      return false;
    }
    target = target[0];
  }
  const { currentPageArea, currentContentArea } = root[$extra];
  if (node.targetType === "pageArea") {
    if (!(target instanceof PageArea)) {
      target = null;
    }
    if (node.startNew) {
      node[$extra].target = target || currentPageArea;
      return true;
    } else if (target && target !== currentPageArea) {