ADDITIONAL SYSTEM INFORMATION :
Linux / Ubuntu 22.04, KDE 5.24.7 X11, 5.15.0 x64 / JDK 22, OpenJFX 22


A DESCRIPTION OF THE PROBLEM :
Emoji symbols in the TextArea are either not displayed or displayed in greyscale. The number of symbols displayed depends on the emoji font used. To rule out a system misconfiguration problem, any other non-JavaFX editor (tested in Kate, SublimeText, LibreOffice and also QT/KDE text input fields) has no problems displaying emoji.

Screenshot comparing different fonts is available on SO: https://stackoverflow.com/questions/78813276/is-it-possible-to-display-emoji-inside-javafx-textarea

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run the code attached.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
All emoji are shown in color.
ACTUAL -
Emoji are partially displayed (depending on the font) and in greyscale.

---------- BEGIN SOURCE ----------
public class Main extends Application {

    @Override
    public void start(Stage stage) {
        var eta = new TextArea("""
                😀 😃 😄 😁 😆 😅 😂 🤣 🥲 🥹 😊 😇 🙂 🙃 😉 😌 😍 🥰 😘 😗 😙 😚 😋 😛 😝 😜 🤪
                🤨 🧐 🤓 😎 🥸 🤩 🥳 🙂‍ 😏 😒 🙂‍ 😞 😔 😟 😕 🙁 ☹️ 😣 😖 😫 😩 🥺 😢 😭 😮 😤 😠
                😡 🤬 🤯 😳 🥵 🥶 😱 😨 😰 😥 😓 🫣 🤗 🫡 🤔 🫢 🤭 🤫 🤥 😶 😶 😐 😑 😬 🫨 🫠 🙄
                😯 😦 😧 😮 😲 🥱 😴 🤤 😪 😵 😵 🫥 🤐 🥴 🤢 🤮 🤧 😷 🤒 🤕 🤑 🤠 😈 👿 👹 👺 🤡
                💩 👻 💀 👽 👾 🤖 🎃 😺 😸 😹 😻 😼 😽 🙀 😿 😾
                """);

        Scene scene = new Scene(new VBox(eta), 640, 480);
        stage.setScene(scene);
        stage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}
---------- END SOURCE ----------

FREQUENCY : always