Running the following code:

@Override
    public void start(Stage primaryStage) {
        final Scene scene = new Scene(new StackPane(new Label("Utility Window")), 600, 400);
        primaryStage.setTitle("Main Window - JDK" + System.getProperty("java.version"));
        primaryStage.initStyle(StageStyle.UTILITY);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

shows the expected utility window when running with any JavaFX version and any JDK version lower than 25 ("utility-24.png"), but when running with JDK 25 or higher, the minimize and maximize buttons show up unexpectedly, at a wrong position ("utility-25.png").