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

return HTMLResult.success({
    name: "div",
    attributes: {
      class: ["xfaRich"],
      style: Object.create(null),
    },
    children: [
      {
        name: "span",
        attributes: {
          style: Object.create(null),
        },
        value,
      },
    ],
  });
}
function setFirstUnsplittable(node) {