I don't know whether this is a problem with the test or with the runtime, but the following test started failing on Linux recently (within the last few days).

javafx.scene.control.TreeTableViewMouseInputTest > test_rt30394 FAILED
    java.lang.AssertionError: expected:<1> but was:<0>
        at org.junit.Assert.fail(Assert.java:91)
        at org.junit.Assert.failNotEquals(Assert.java:645)
        at org.junit.Assert.assertEquals(Assert.java:126)
        at org.junit.Assert.assertEquals(Assert.java:470)
        at org.junit.Assert.assertEquals(Assert.java:454)
        at javafx.scene.control.TreeTableViewMouseInputTest.test_rt30394(TreeTableViewMouseInputTest.java:258)