KeyEvent.getModifiers() returns inconsistent values for ALT keys

Seeing some inconsistent behaviour with KeyEvent.getModifiers() for right and left ALT keys in JDK > 1.8

/**
 *
 * Steps : Run this file using JDK 1.8, Windows, Mac OSX,
 * Invoke Left-ALT key, note keyEvent.getModifiers() is 8(InputEvent.ALT_MASK)
 * Invoke right-ALT key, getModifiers() returns 8.
 *
 * Run using JDK 11, Windows
 * Invoke Left-ALT key, note keyEvent.getModifiers() is 8
 * Invoke right-ALT key, getModifiers() returns 40.
 * Switching between left and right alt keys returns same result.
 *
 * Run using JDK 11, Mac
 * Invoke Left-ALT key, note keyEvent.getModifiers() is 8
 * Invoke right-ALT key, getModifiers() returns 40(InputEvent.ALT_MASK | InputEvent.ALT_GRAPH_MASK).
 * Now again press left alt key,it now starts returning getModifiers as 40, getModifiersEx also returns different value.
 *
 * Issues/Questions:
 * KeyEvent.getModifiers() for ALT keys has changed after JDK 1.8. Is this expected behaviour?
 * Is getModifiers() expected to be different for Left ALT key and Rt ALT keys on Windows?
 * Is getModifiers, getModifersEx expected to return diff values on Mac and Windows?
 * In Mac, left alt key getModifiers, getModifiersEx changing after rt alt key is selected, on JDK 11, looks to be a bug.
 */
public class JavaApplication1 {

    public static void main(String[] args) {
       JTextField comp = new JTextField();
       comp.addKeyListener(new MyListener());
       JFrame f = new JFrame();
       f.add(comp);
       f.setSize(100,100);
       f.setVisible(true);
    }
}
    class MyListener implements KeyListener {

    public MyListener() {
    }

    @Override
    public void keyTyped(KeyEvent e) {
        
    }

    @Override
    public void keyPressed(KeyEvent e) {
        System.out.println("ModEx : " +e.getModifiersEx());
        System.out.println("Mod : " +e.getModifiers());
        System.out.println("-----------");
        
        
    }

    @Override
    public void keyReleased(KeyEvent e) {
        
    }
    
}