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

while (node) {
    if (!node.traversal) {
      node[$tabIndex] = node[$getParent]()[$tabIndex];
      return;
    }
    if (node[$tabIndex]) {
      return;
    }
    let next = null;
    for (const child of node.traversal[$getChildren]()) {
      if (child.operation === "next") {
        next = child;
        break;
      }
    }
    if (!next || !next.ref) {
      node[$tabIndex] = node[$getParent]()[$tabIndex];
      return;
    }
    const root = node[$getTemplateRoot]();
    node[$tabIndex] = ++root[$tabIndex];
    const ref = root[$searchNode](next.ref, node);
    if (!ref) {
      return;
    }
    node = ref[0];
  }
}
function applyAssist(obj, attributes) {