PointerEventTest fails consistently on Ubuntu 20.04 and 22.04.

$ gradle -PFULL_TEST=true -PUSE_ROBOT=true cleanTest :systemTests:test --tests PointerEventTest

PointerEventTest > testRightButtonDrag FAILED
    java.lang.AssertionError: expected:<2> but was:<0>
        at org.junit.Assert.fail(Assert.java:89)
        at org.junit.Assert.failNotEquals(Assert.java:835)
        at org.junit.Assert.assertEquals(Assert.java:647)
        at org.junit.Assert.assertEquals(Assert.java:633)
        at test.robot.javafx.web.PointerEventTest.testRightButtonDrag(PointerEventTest.java:149)