Intermittent unit test failures in RegionCSSTest

I am seeing intermittent unit test failures in test.javafx.scene.layout.RegionCSSTest, both in our nightly job and on my local Windows machine (although this is a platform-independent issue). When it fails, 78 of the tests in RegionCSSTest fail. I will attach the complete test log. Here is a sample of two of the failures:

test.javafx.scene.layout.RegionCSSTest > borderImageSourceIsNull FAILED
    java.lang.AssertionError:
        at org.junit.Assert.fail(Assert.java:91)
        at org.junit.Assert.assertTrue(Assert.java:43)
        at org.junit.Assert.assertNull(Assert.java:549)
        at org.junit.Assert.assertNull(Assert.java:560)
        at test.javafx.scene.layout.RegionCSSTest.borderImageSourceIsNull(RegionCSSTest.java:3082)

test.javafx.scene.layout.RegionCSSTest > backgroundSize_auto_length FAILED
    java.lang.AssertionError: expected:<0.0> but was:<1.0>
        at org.junit.Assert.fail(Assert.java:91)
        at org.junit.Assert.failNotEquals(Assert.java:645)
        at org.junit.Assert.assertEquals(Assert.java:441)
        at org.junit.Assert.assertEquals(Assert.java:510)
        at test.javafx.scene.layout.RegionCSSTest.backgroundSize_auto_length(RegionCSSTest.java:1352)

...

23001 tests completed, 78 failed, 274 skipped