Attach (recommended) or Link to PDF file here:
issue13500 (in test corpus)

This regressed when landing #13566. 

What is the expected behavior? (add screenshot)
<img width="664" alt="image" src="https://user-images.githubusercontent.com/942640/122467522-7bc8aa80-cf6f-11eb-9d4d-311eb7c64fb2.png">


What went wrong? (add screenshot)
![image](https://user-images.githubusercontent.com/942640/122467565-85eaa900-cf6f-11eb-9c10-8a8686ed440c.png)


constructor(attributes) {
    super(TEMPLATE_NS_ID, "pageArea",  true);
    this.blankOrNotBlank = getStringOption(attributes.blankOrNotBlank, [
      "any",
      "blank",
      "notBlank",
    ]);
    this.id = attributes.id || "";
    this.initialNumber = getInteger({
      data: attributes.initialNumber,
      defaultValue: 1,
      validate: x => true,
    });
    this.name = attributes.name || "";
    this.numbered = getInteger({
      data: attributes.numbered,
      defaultValue: 1,
      validate: x => true,
    });
    this.oddOrEven = getStringOption(attributes.oddOrEven, [
      "any",
      "even",
      "odd",
    ]);
    this.pagePosition = getStringOption(attributes.pagePosition, [
      "any",
      "first",
      "last",
      "only",