Attach (recommended) or Link to PDF file here:
[Form_MGT-7.pdf](https://github.com/mozilla/pdf.js/files/6768253/Form_MGT-7.pdf)

When we try to open the above pdf, we get in the console:
```
Warning: XFA - an error occured during parsing and binding: TypeError: x.include is not a function
```
which is caused by a typo:
https://github.com/mozilla/pdf.js/blob/b9e84ba70ec5a4a30333b9092f316c9ec7b7f079/src/core/xfa/config.js#L174
 
So fixing the typo allows to open the pdf but there is only 1 page when we have 9 in using masterpdfeditor.
const items = field.items;
      let displayedIndex = 0;
      let saveIndex = 0;
      if (items.children.length === 2) {
        displayedIndex = items.children[0].save;
        saveIndex = 1 - displayedIndex;
      }
      const displayed = items.children[displayedIndex][$toHTML]().html;
      const values = items.children[saveIndex][$toHTML]().html;
      let selected = false;
      const value = (field.value && field.value[$text]()) || "";
      for (let i = 0, ii = displayed.length; i < ii; i++) {
        const option = {
          name: "option",
          attributes: {
            value: values[i] || displayed[i],
          },
          value: displayed[i],
        };
        if (values[i] === value) {
          option.attributes.selected = selected = true;
        }
        children.push(option);
      }
      if (!selected) {
        children.splice(0, 0, {
          name: "option",
          attributes: {
            hidden: true,
            selected: true,