Attach (recommended) or Link to PDF file here:
[0 NIF MODELO 30.pdf](https://github.com/mozilla/pdf.js/files/7187486/0.NIF.MODELO.30.2.pdf)

Configuration:
- Web browser and its version: firefox nightly
- Operating system and its version: linux debian

Steps to reproduce the problem:
1. Open the PDF
2. Click on the button  `Rellenar Formulario` (top right of the first page)
3. There is the pop-up "Stay... or Leave...`.

It's a bit annoying from the user pov and it doesn't make sense (nobody wants to leave the form but just reset it)

It works fine when replacing  `""` by `"#"` here:
https://github.com/mozilla/pdf.js/blob/7082ff9bf876b98fbda118cdbd6267d3c0df6948/src/display/annotation_layer.js#L483

@Snuffleupagus, you changed this few month ago:
https://github.com/mozilla/pdf.js/commit/e2b6d79dee9ffd2aba715d6b3cb8fa143d86153c

do you have some ideas ?
const element = document.createElement("input");
    element.disabled = data.readOnly;
    element.type = "checkbox";
    element.name = data.fieldName;
    if (value) {
      element.setAttribute("checked", true);
    }
    element.setAttribute("id", id);
    element.setAttribute("exportValue", data.exportValue);
    element.tabIndex = DEFAULT_TAB_INDEX;
    element.addEventListener("change", function (event) {
      const name = event.target.name;
      const checked = event.target.checked;
      for (const checkbox of document.getElementsByName(name)) {
        if (checkbox !== event.target) {
          checkbox.checked =
            checked &&
            checkbox.getAttribute("exportValue") === data.exportValue;
          storage.setValue(
            checkbox.parentNode.getAttribute("data-annotation-id"),
            { value: false }
          );
        }
      }
      storage.setValue(id, { value: checked });
    });
    if (this.enableScripting && this.hasJSActions) {
      element.addEventListener("updatefromsandbox", jsEvent => {
        const actions = {
          value(event) {