StageStyle.UTILITY doesn't always work with stage.setAlwaysOnTop(true)

[Александр Свиридов]

 I have application which consits only of one stage:
stage.initStyle(StageStyle.UTILITY);
stage.setAlwaysOnTop(true);

And I use oracle java 1.8.60

And I start my application 5 times. 2 times the window is on top of others. 3 
times it's not of top of others. There is a bug in javafx. My OS - centos 7.1

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Александр Свиридов