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 (!this[$extra]) {
      this[$extra] = {
        numberOfUse: 1,
        pageIndex: -1,
        pageSetIndex: -1,
      };
    }
    if (this.relation === "orderedOccurrence") {
      if (this[$extra].pageIndex + 1 < this.pageArea.children.length) {
        this[$extra].pageIndex += 1;
        const pageArea = this.pageArea.children[this[$extra].pageIndex];
        return pageArea[$getNextPage]();
      }
      if (this[$extra].pageSetIndex + 1 < this.pageSet.children.length) {
        this[$extra].pageSetIndex += 1;
        return this.pageSet.children[this[$extra].pageSetIndex][$getNextPage]();
      }
      if (this[$isUsable]()) {
        this[$extra].numberOfUse += 1;
        this[$extra].pageIndex = -1;
        this[$extra].pageSetIndex = -1;
        return this[$getNextPage]();
      }
      const parent = this[$getParent]();
      if (parent instanceof PageSet) {