FULL PRODUCT VERSION :
java version "1.8.0_92"
Java(TM) SE Runtime Environment (build 1.8.0_92-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.92-b14, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
OS X El Capitan 10.11.5

A DESCRIPTION OF THE PROBLEM :
Under certain conditions text layout performed by Font.layoutGlyphVector method generates wrong glyphs for logical fonts (e.g. Monospaced) on OS X.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run sample program with code given below.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Cyrillic letter 'а' is rendered in plain and italic fonts.
ACTUAL -
Instead of italic 'а' letter, italic 'г' is rendered.

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import javax.swing.*;
import java.awt.*;
import java.awt.font.FontRenderContext;
import java.awt.font.GlyphVector;

public class MonospacedLayoutTest {
    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> {
            JFrame frame = new JFrame();
            frame.add(new MyComponent());
            frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
            frame.setSize(150, 150);
            frame.setLocationRelativeTo(null);
            frame.setVisible(true);

        });
    }

    private static class MyComponent extends JComponent {
        private final Font fontP = new Font(Font.MONOSPACED, Font.PLAIN, 30);
        private final Font fontI = new Font(Font.MONOSPACED, Font.ITALIC, 30);
        private final String text = "а"; // cyrillic letter a

        @Override
        protected void paintComponent(Graphics g) {
            g.setColor(Color.black);
            FontRenderContext frc = new FontRenderContext(null, false, false);
            GlyphVector gvP = fontP.layoutGlyphVector(frc, text.toCharArray(), 0, text.length(),
                                                      Font.LAYOUT_LEFT_TO_RIGHT);
            ((Graphics2D) g).drawGlyphVector(gvP, 70, 50);
            GlyphVector gvI = fontI.layoutGlyphVector(frc, text.toCharArray(), 0, text.length(),
                                                      Font.LAYOUT_LEFT_TO_RIGHT);
            ((Graphics2D) g).drawGlyphVector(gvI, 70, 100);
        }
    }
}

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

CUSTOMER SUBMITTED WORKAROUND :
Workaround is to use corresponding system font instead of Java logical font to render text (e.g. using Menlo instead of Monospaced).