When uploading a pdf file, I get Warning: Unimplemented widget field type "null", falling back to base field type at pdf.worker.js. The file is not loading.
I'm using the chrome browser. All other files are processed fine, but this one is not. Help solve the problem.
[usn2020.pdf](https://github.com/mozilla/pdf.js/files/5936611/usn2020.pdf)

}
      code = stringToPDFString(code);
      if (code) {
        list.push(code);
      }
    }
    _collectJS(entry.getRaw("Next"), xref, list, parents);
  }
  if (parent) {
    parents.remove(parent);
  }
}
function collectActions(xref, dict, eventType) {
  const actions = Object.create(null);
  if (dict.has("AA")) {
    const additionalActions = dict.get("AA");
    for (const key of additionalActions.getKeys()) {
      const action = eventType[key];
      if (!action) {
        continue;
      }
      const actionDict = additionalActions.getRaw(key);
      const parents = new RefSet();
      const list = [];
      _collectJS(actionDict, xref, list, parents);
      if (list.length > 0) {
        actions[action] = list;
      }
    }
  }