In case an application uses Swing and AWT toplevels all together, and a Swing toplevel is initialised first then all subsequent AWT topleves get swing FocusTraversalPolicy, which is LayoutFocusTraversalPolicy. However, the correct default FTP for an AWT toplevel is DefaultFocusTraversalPolicy (unless a developer explicitly sets another FTP).

The test case:

import java.awt.Frame;
import javax.swing.JFrame;

public class FocusPolicyTest {
    public static void main(String[] args) {
        JFrame f0 = new JFrame("Swing");
        f0.setVisible(true);
        System.out.println("FTP for Swing: " + f0.getFocusTraversalPolicy());
        
        Frame f1 = new Frame("AWT");
        f1.setVisible(true);
        System.out.println("FTP for AWT: " + f1.getFocusTraversalPolicy());
    }
}