Can't fallback Font to Helvetica in PdfGraphics2D

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Describe the bug

We can't generate PDF document from code below and got error:

Font creation failed for Helvetica.
java.lang.RuntimeException: Font creation failed for Helvetica.

To Reproduce

Code to reproduce the issue

Unit Test

import com.lowagie.text.Document;
import com.lowagie.text.pdf.LayoutProcessor;
import com.lowagie.text.pdf.PdfReader;
import com.lowagie.text.pdf.PdfWriter;
import org.junit.jupiter.api.Test;

import java.awt.*;
import java.awt.geom.Area;
import java.awt.geom.Ellipse2D;
import java.awt.print.*;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;

class PdfConverterTest {

    private static int generateContent(Graphics g, PageFormat pf, int i) {
        var   g2 = (Graphics2D) g;
        float h  = (float) pf.getHeight();
        float w  = (float) pf.getWidth();

        Ellipse2D.Double circle = new Ellipse2D.Double();
        Ellipse2D.Double oval   = new Ellipse2D.Double();
        Ellipse2D.Double leaf   = new Ellipse2D.Double();
        Ellipse2D.Double stem   = new Ellipse2D.Double();
        g2.setColor(Color.green);

        double eh = h / 2;
        double ew = w / 2;
        leaf.setFrame(ew - 16, eh - 29, 15.0, 15.0);
        Area leaf1 = new Area(leaf);
        leaf.setFrame(ew - 14, eh - 47, 30.0, 30.0);
        Area leaf2 = new Area(leaf);
        leaf1.intersect(leaf2);
        g2.fill(leaf1);

        // Creates the second leaf.
        leaf.setFrame(ew + 1, eh - 29, 15.0, 15.0);
        leaf1 = new Area(leaf);
        leaf2.intersect(leaf1);
        g2.fill(leaf2);

        g2.setColor(Color.black);

        // Creates the stem by filling the Area resulting from the subtraction of two Area objects created from an
        // ellipse.
        stem.setFrame(ew, eh - 42, 40.0, 40.0);
        Area st1 = new Area(stem);
        stem.setFrame(ew + 3, eh - 47, 50.0, 50.0);
        Area st2 = new Area(stem);
        st1.subtract(st2);
        g2.fill(st1);

        g2.setColor(Color.yellow);

        // Creates the pear itself by filling the Area resulting from the union of two Area objects created by two
        // different ellipses.
        circle.setFrame(ew - 25, eh, 50.0, 50.0);
        oval.setFrame(ew - 19, eh - 20, 40.0, 70.0);

        Area circ = new Area();
        circ.add(new Area(circle));
        circ.add(new Area(oval));
        g2.fill(circ);
        g2.setColor(Color.black);
        g2.setFont(new Font("Arial", Font.PLAIN, 18));
        String      pear    = "Pear";
        FontMetrics metrics = g2.getFontMetrics();
        int         width   = metrics.stringWidth(pear);
        g2.drawString(pear, (w - width) / 2, 20);

        return Printable.PAGE_EXISTS;
    }

    private static PageFormat getPageFormat(double width, double height, int orientation) {
        PageFormat pageFormat = new PageFormat();
        Paper      paper      = pageFormat.getPaper();
        paper.setSize(width, height);
        paper.setImageableArea(0, 0, paper.getWidth(), paper.getHeight());
        pageFormat.setPaper(paper);
        pageFormat.setOrientation(orientation);
        return pageFormat;
    }

    @Test
    void generateFromPageable() throws IOException, PrinterException {
        Book book = new Book();
        book.append(
                PdfConverterTest::generateContent,
                getPageFormat(595.2755905511812, 841.8897637795277, PageFormat.PORTRAIT));

        LayoutProcessor.enable();

        byte[] pdfContentByte;
        try (var outputStream = new ByteArrayOutputStream()) {
            try (var document = new Document()) {
                var writer = PdfWriter.getInstance(document, outputStream);
                document.open();

                var contentByte = writer.getDirectContent();
                var totalPages  = book.getNumberOfPages();
                for (var i = 0; i < totalPages; i++) {
                    var   pageFormat = book.getPageFormat(i);
                    var   printable  = book.getPrintable(i);
                    float pageW      = (float) pageFormat.getWidth();
                    float pageH      = (float) pageFormat.getHeight();
                    float marginL    = (float) pageFormat.getImageableX();
                    float marginT    = (float) pageFormat.getImageableY();
                    float marginR    = (float) (pageW - pageFormat.getImageableWidth());
                    float marginB    = (float) (pageH - pageFormat.getImageableHeight());

                    document.setPageSize(new com.lowagie.text.Rectangle(pageW, pageH));
                    document.setMargins(marginL, marginR, marginT, marginB);
                    document.newPage();

                    Graphics2D g2 = contentByte.createGraphics(pageW, pageH);
                    printable.print(g2, pageFormat, i);
                    g2.dispose();
                    contentByte.sanityCheck();
                }
            }
            pdfContentByte = outputStream.toByteArray();
        }

        try (var inputStream = new ByteArrayInputStream(pdfContentByte)) {
            new PdfReader(inputStream);
        }
    }
}

Expected behavior

This code should generate a PDF normally

System

(please complete the following information)

• OS: MacOS 14.4.1
• Used font: new Font(Font.SANS_SERIF, Font.PLAIN, 12)
• OpenPDF version: 2.0.2