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)

const font = await this._getFontData(evaluator, task);
    let descent = font.descent;
    if (isNaN(descent)) {
      descent = 0;
    }
    const vPadding = defaultPadding + Math.abs(descent) * fontSize;
    const alignment = this.data.textAlignment;
    if (this.data.multiLine) {
      return this._getMultilineAppearance(
        defaultAppearance,
        value,
        font,
        fontSize,
        totalWidth,
        totalHeight,
        alignment,
        hPadding,
        vPadding
      );
    }
    
    const encodedString = font.encodeString(value).join("");
    if (this.data.comb) {
      return this._getCombAppearance(
        defaultAppearance,
        font,
        encodedString,
        totalWidth,
        hPadding,
        vPadding