Broken fontmetrics when printing Text using background with alpha channel

ADDITIONAL SYSTEM INFORMATION :
Can be reproduced at least in Windows 64-bit and in Linux 64-bit
Can be reproduced at least in Java 10.0.2 and in Java 11.0.2
Can NOT be reproduced in Java 8

A DESCRIPTION OF THE PROBLEM :
When drawing text using background with alpha channel fontmetrics return invalid values, for example getStringBounds returns a zero rectangle and getAscent returns a negative value. So most applications will print such strings at wrong locations. Problem only occurs when printing, not when drawing in a panel.
JTable.print() is also broken when used with Nimbus L&F - I suppose this is the same problem

REGRESSION : Last worked in version 8u201

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run class SwingTextPrintBugFrame2 from test case in Java 10.0.2 or java 11.0.2



EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Java version number should be shown as text 3 times side by side in JFrame and on printout
ACTUAL -
Java version number is shown as text 3 times side by side in JFrame but NOT on printout: printout is broken

---------- BEGIN SOURCE ----------
package bugs.swing_text_print;

import java.awt.*;
import java.awt.font.*;
import java.awt.geom.AffineTransform;
import java.awt.print.*;
import java.util.*;
import javax.swing.*;

/**
 *
 * @author werner
 */
public class SwingTextPrintBugFrame2 extends JFrame
{
  private final String TEXT =
    "* " +System.getProperty("java.version")+" *";

  private javax.swing.JButton btPrint;
  
  /**
   * Creates new form SwingTextPrintBugFrame
   */
  public SwingTextPrintBugFrame2()
  {
    initComponents();
    final JPanel pMain =
      new JPanel()
      {
        @Override
        public void paint(final Graphics g)
        {
          super.paint(g);
          drawText((Graphics2D)g);
        }
      };
    pMain.setPreferredSize(new Dimension(360,100));
    getContentPane().add(pMain);
    pack();
  }
  
  private void initComponents()
  {

    btPrint = new javax.swing.JButton();

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

    btPrint.setText("Print");
    btPrint.addActionListener(new java.awt.event.ActionListener()
    {
      public void actionPerformed(java.awt.event.ActionEvent evt)
      {
        onPrint(evt);
      }
    });
    getContentPane().add(btPrint, java.awt.BorderLayout.PAGE_END);

    pack();
  }
  private void drawText(final Graphics2D g2)
  {
    final Map<java.text.AttributedCharacterIterator.Attribute,Object>
      fontMap = new HashMap<>();
    fontMap.put(TextAttribute.FAMILY,"SansSerif");
    fontMap.put(TextAttribute.SIZE,17F+2F/3F);
    fontMap.put(TextAttribute.FOREGROUND,Color.BLACK);
    fontMap.put(TextAttribute.WEIGHT,TextAttribute.WEIGHT_BOLD);

    //setRenderingHints(g2);
    int baseX = 10, baseY = 50;
    for (int i=0;i<3;i++)
    {
      if (i==2) // Bug only occurs if Text has background WITH ALPHA!
        fontMap.put(TextAttribute.BACKGROUND, new Color(0,0,255,64));
      final Font font = new Font(fontMap);
      final FontMetrics fontMetrics = g2.getFontMetrics(font);
      final Rectangle rect =
        fontMetrics.getStringBounds(TEXT, g2).getBounds();
      System.out.println("***** "+rect+" / "+fontMetrics.getAscent());
      final int
        ascent = fontMetrics.getAscent(), // Bug: ascent gets negative!
        width= rect.width; // Bug: width gets zero!
      final TextLayout textLayout =
        new TextLayout(TEXT, font, fontMetrics.getFontRenderContext());
      textLayout.getBounds();
      
      textLayout.draw(g2, baseX, baseY+ascent);
      g2.drawRect(baseX, baseY, rect.width, rect.height);
      
      baseX += width+10;
    }
  }
  
  private Printable getPrintable()
  {
    return new Printable()
    {
      @Override
      public int print(Graphics graphics, PageFormat pageFormat, int pageIndex)
        throws PrinterException
      {
        final Graphics2D g2 = (Graphics2D)graphics;
        final AffineTransform at = g2.getTransform();
        at.translate((int)pageFormat.getImageableX(), (int)pageFormat.getImageableY());
        //at.scale(0.7, 0.7);
        g2.setTransform(at);
        drawText(g2);
        return pageIndex==0 ? Printable.PAGE_EXISTS : Printable.NO_SUCH_PAGE;
      }
    };
  }
  
  private void onPrint(java.awt.event.ActionEvent evt)
  {
    final PrinterJob pj = PrinterJob.getPrinterJob();
    if (!pj.printDialog())
      return;
    pj.setPrintable(getPrintable(), pj.defaultPage());
    try
    {
      pj.print();
    }
    catch (final Exception ex)
    {
      ex.printStackTrace();
    }
  }
  
  public static void main(String[] args)
  {
      java.awt.EventQueue.invokeLater(new Runnable()
    {
      @Override
      public void run()
      {
        new SwingTextPrintBugFrame2().setVisible(true);
      }
    });
    
  }
}

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
None known

FREQUENCY : always