Visual bug when using JTextField and setBackground color on toolbar.

ADDITIONAL SYSTEM INFORMATION :
Windows 10


A DESCRIPTION OF THE PROBLEM :
When using textfield in toolbar with .setBackground color set graphical glitch appears displaying other components and when changing input character.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
run program, enter text of different characters into text field.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Cleared text field with no graphical glitches.
ACTUAL -
Show elements of other components on frame and corrupted characters.

---------- BEGIN SOURCE ----------
package app;

public class App {

    public static void main(String[] args) {
        Overview ov = new Overview();
    }
    
}

package app;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import javax.swing.BorderFactory;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JScrollBar;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.JToolBar;
import javax.swing.border.Border;

public class Overview {

    //create frame
    JFrame myF = new JFrame();
    //create panel for menu
    JPanel menuP;
    JPanel editP;
    //create menu bar
    JMenuBar menuBar = new JMenuBar();
    //create file and edit menus
    JMenu fileMenu = new JMenu("File");
    JMenu editMenu = new JMenu("Edit");
    //items for file menu
    JMenuItem newItem = new JMenuItem("New");
    JMenuItem openItem = new JMenuItem("Open");
    JMenuItem saveItem = new JMenuItem("Save");
    JMenuItem saveAllItem = new JMenuItem("Save all");

    //items for edit menu
    JMenuItem undoItem = new JMenuItem("Undo");
    JMenuItem redoItem = new JMenuItem("Redo");

    JMenuItem cutItem = new JMenuItem("");
    JMenuItem copyItem = new JMenuItem("");
    JMenuItem pasteItem = new JMenuItem("");

    JMenuItem find = new JMenuItem("");

    //create toolbar
    JToolBar toolBar = new JToolBar();
    //create buttons for toolbar
    JButton newBtn = new JButton("new");
    JButton openBtn = new JButton("open");
    JButton saveBtn = new JButton("Save");
    JButton saveAllBtn = new JButton("Save all");
    JButton findBtn = new JButton("Search");
    JTextField findField = new JTextField();

    ImageIcon newIcon = new ImageIcon("images/new file.png");
    ImageIcon openIcon = new ImageIcon("images/open.png");
    ImageIcon saveIcon = new ImageIcon("images/save.png");
    ImageIcon saveAllIcon = new ImageIcon("images/save all.png");
    ImageIcon findIcon = new ImageIcon("images/find.png");

    JTextArea textArea = new JTextArea();
    JScrollBar scroll;

    //create empty borders to apply to buttons in the toolbar
    Border emptyBorder = BorderFactory.createEmptyBorder();

    Overview() {
        myF.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        myF.setSize(700, 400);
        myF.setVisible(true);

        menuP = new JPanel();
        editP = new JPanel();

        scroll = new JScrollBar();

        editP.add(textArea);

        myF.setJMenuBar(menuBar);

        menuBar.add(fileMenu);

        menuBar.add(editMenu);

        fileMenu.add(newItem);
        fileMenu.add(openItem);
        fileMenu.add(saveItem);
        fileMenu.add(saveAllItem);
        editMenu.add(undoItem);
        editMenu.add(redoItem);

        Dimension d = new Dimension(600, 50);
        toolBar.setPreferredSize(d);
        Dimension textD = new Dimension(600, 200);
        textArea.setPreferredSize(textD);

        toolBar.setBorder(emptyBorder);

        newBtn.setBorder(emptyBorder);
        openBtn.setBorder(emptyBorder);
        saveBtn.setBorder(emptyBorder);
        saveAllBtn.setBorder(emptyBorder);
        findField.setBorder(emptyBorder);
        findBtn.setBorder(emptyBorder);

        //remove focus for buttons
        newBtn.setFocusable(false);
        openBtn.setFocusable(false);
        saveBtn.setFocusable(false);
        saveAllBtn.setFocusable(false);
        findField.setBorder(emptyBorder);

        Font findFieldF = new Font("Arial", 0, 30);
        Font findBtnF = new Font("Arial", 0, 30);

        findField.setFont(findFieldF);
        findBtn.setFont(findBtnF);
        findField.setBackground(new Color(10, 200, 80, 12));
        findBtn.setBackground(new Color(5, 200, 80, 250));
        //set icons for buttons
        newBtn.setIcon(newIcon);
        openBtn.setIcon(openIcon);
        saveBtn.setIcon(saveIcon);
        saveAllBtn.setIcon(saveAllIcon);

        //add buttons to toolbars
        toolBar.add(newBtn);
        toolBar.add(openBtn);
        toolBar.add(saveBtn);
        toolBar.add(saveAllBtn);
        toolBar.add(findField);

        toolBar.add(findBtn);

        myF.add(menuP, BorderLayout.WEST);
        myF.add(editP, BorderLayout.SOUTH);
        menuP.add(toolBar);

    }

}

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

CUSTOMER SUBMITTED WORKAROUND :
remove .setBackground(new Color(10, 200, 70, 20); from code.


FREQUENCY : always