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 ?
print: event.detail.print,
        });
      },
      hidden: event => {
        event.target.style.visibility = event.detail.hidden
          ? "hidden"
          : "visible";
        this.annotationStorage.setValue(this.data.id, {
          hidden: event.detail.hidden,
        });
      },
      focus: event => {
        setTimeout(() => event.target.focus({ preventScroll: false }), 0);
      },
      userName: event => {
        
        event.target.title = event.detail.userName;
      },
      readonly: event => {
        if (event.detail.readonly) {
          event.target.setAttribute("readonly", "");
        } else {
          event.target.removeAttribute("readonly");
        }
      },
      required: event => {
        if (event.detail.required) {
          event.target.setAttribute("required", "");
        } else {
          event.target.removeAttribute("required");