Attach (recommended) or Link to PDF file here:
[docOficialPDF.php.pdf](https://github.com/mozilla/pdf.js/files/7159923/docOficialPDF.php.pdf)

Configuration:
- Web browser and its version: Firefox nightly
- Operating system and its version: linux debian
- PDF.js version: built-in viewer
- Is a browser extension: no

Steps to reproduce the problem:
1. Open the pdf page 2
2. Checkbox "Alta" in section 2 must be checked

It works fine with evince.
const operatorList = new OperatorList();
    const initialState = {
      font: null,
      clone() {
        return this;
      },
    };
    const { fontName, fontSize } = this.data.defaultAppearanceData;
    await evaluator.handleSetFont(
      this._fieldResources.mergedResources,
      [fontName && Name.get(fontName), fontSize],
       null,
      operatorList,
      task,
      initialState,
       null
    );
    return initialState.font;
  }
  _computeFontSize(height, lineCount) {
    let { fontSize } = this.data.defaultAppearanceData;
    if (!fontSize) {
      
      
      
      const roundWithOneDigit = x => Math.round(x * 10) / 10;