Attach (recommended) or Link to PDF file here:
https://www.canada.ca/content/dam/ircc/migration/ircc/english/pdf/kits/forms/eimm5669e.pdf
[eimm5669e.pdf](https://github.com/mozilla/pdf.js/files/7225677/eimm5669e.2.pdf)

Configuration:
- Web browser and its version: Firefox nightly
- Operating system and its version: Linux Debian

Steps to reproduce the problem:
1. Look at the bottom of page 2

constructor(attributes) {
    super(TEMPLATE_NS_ID, "subjectDN");
    this.delimiter = attributes.delimiter || ",";
    this.id = attributes.id || "";
    this.name = attributes.name || "";
    this.use = attributes.use || "";
    this.usehref = attributes.usehref || "";
  }
  [$finalize]() {
    this[$content] = new Map(
      this[$content].split(this.delimiter).map(kv => {
        kv = kv.split("=", 2);
        kv[0] = kv[0].trim();
        return kv;
      })
    );
  }
}
class SubjectDNs extends XFAObject {
  constructor(attributes) {
    super(TEMPLATE_NS_ID, "subjectDNs",  true);
    this.id = attributes.id || "";
    this.type = getStringOption(attributes.type, ["optional", "required"]);
    this.use = attributes.use || "";
    this.usehref = attributes.usehref || "";
    this.subjectDN = new XFAObjectArray();
  }
}
class Submit extends XFAObject {