I see the following two test failures on my Linux machine about 1/3 of the time.

test.robot.javafx.scene.AfterModalClosedTest > testResizability FAILED
    java.lang.AssertionError: Window is not resized
        at org.junit.Assert.fail(Assert.java:91)
        at org.junit.Assert.assertTrue(Assert.java:43)
        at test.robot.javafx.scene.AfterModalClosedTest.testResizability(AfterModalClosedTest.java:121)


test.javafx.stage.ChildStageLocationTest > testLocation FAILED
    junit.framework.AssertionFailedError: Child stage X location should be >924.5
        at junit.framework.Assert.fail(Assert.java:47)
        at junit.framework.Assert.assertTrue(Assert.java:20)
        at test.javafx.stage.ChildStageLocationTest.testLocation(ChildStageLocationTest.java:90)

These are new unit tests, and is likely a problem with the tests.