JavaScriptBridgeTest::testBridgeExplicitOverloading test fails when run with newer JDK 8u

The JavaScriptBridgeTest::testBridgeExplicitOverloading test in FX 8u-dev is failing when I run with a recent JDK 8u release such as JDK 8u181.

$ gradle --info :web:test --tests javafx.scene.web.JavaScriptBridgeTest
javafx.scene.web.JavaScriptBridgeTest > testBridgeExplicitOverloading FAILED
    java.lang.AssertionError: expected same:<[Ljava.lang.Integer;@7945dc0e> was not:<undefined>
        at org.junit.Assert.fail(Assert.java:91)
        at org.junit.Assert.failNotSame(Assert.java:639)
        at org.junit.Assert.assertSame(Assert.java:578)
        at org.junit.Assert.assertSame(Assert.java:591)
        at javafx.scene.web.JavaScriptBridgeTest.lambda$testBridgeExplicitOverloading$12(JavaScriptBridgeTest.java:582)