ADDITIONAL SYSTEM INFORMATION :
MacOS Mojave 10.14.6
java version "1.8.0_221"
Java(TM) SE Runtime Environment (build 1.8.0_221-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.221-b11, mixed mode)


A DESCRIPTION OF THE PROBLEM :
The GraphicsEnvironment.getLocalGraphicsEnvironment () method GetAvailableFontFamilyNames () returns an incorrect font list relative to what is installed on the system.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
0) Install fonts IBM Plex Mono from https://github.com/IBM/plex/releases
1) Run NetBeans 8.2 or newer
2) File/Preferences/Fonts & Colors
3) Click "Font [...]"
4) Navigate to IBM Plex Mono

or

compile & run attached code

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
In Linux this looks like https://www.dropbox.com/s/g4nd0itkygfr8yk/Java-8u212-Fonts-Linux.png?dl=0
ACTUAL -
In macOS this looks like https://www.dropbox.com/s/hcpcyzmff783a2d/Zrzut%20ekranu%202019-08-12%20o%2017.28.33.png?dl=0

---------- BEGIN SOURCE ----------
import java.awt.GraphicsEnvironment;

public class IBMPlexMonoFontsList
{
    public static void main(String[] args)
    {
        String fonts[] =
            GraphicsEnvironment.getLocalGraphicsEnvironment().getAvailableFontFamilyNames();
        for (String font : fonts)
            if (font.startsWith("IBM Plex Mono"))
                System.out.println(font);
    }
}

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

CUSTOMER SUBMITTED WORKAROUND :
Change fonts names.

FREQUENCY : always