Spotted in our CI run:

DrawAfterDeiconifyTest > stageRedrawsAfterDeiconify(StageStyle) > [1] DECORATED FAILED
    org.opentest4j.AssertionFailedError: expected:rgba(0,255,0,255) but was:rgba(250,250,250,255)
        at app//org.junit.jupiter.api.AssertionUtils.fail(AssertionUtils.java:38)
        at app//org.junit.jupiter.api.Assertions.fail(Assertions.java:138)
        at app//test.robot.testharness.VisualTestBase.assertColorEquals(VisualTestBase.java:168)
        at app//test.robot.javafx.stage.DrawAfterDeiconifyTest.lambda$redrawsAfterDeiconify$3(DrawAfterDeiconifyTest.java:96)

DrawAfterDeiconifyTest > stageRedrawsAfterDeiconify(StageStyle) > [2] UNDECORATED FAILED
    org.opentest4j.AssertionFailedError: expected:rgba(0,255,0,255) but was:rgba(250,250,250,255)
        at app//org.junit.jupiter.api.AssertionUtils.fail(AssertionUtils.java:38)
        at app//org.junit.jupiter.api.Assertions.fail(Assertions.java:138)
        at app//test.robot.testharness.VisualTestBase.assertColorEquals(VisualTestBase.java:168)
        at app//test.robot.javafx.stage.DrawAfterDeiconifyTest.lambda$redrawsAfterDeiconify$3(DrawAfterDeiconifyTest.java:96)

DrawAfterDeiconifyTest > stageRedrawsAfterDeiconify(StageStyle) > [3] TRANSPARENT FAILED
    org.opentest4j.AssertionFailedError: expected:rgba(0,255,0,255) but was:rgba(250,250,250,255)
        at app//org.junit.jupiter.api.AssertionUtils.fail(AssertionUtils.java:38)
        at app//org.junit.jupiter.api.Assertions.fail(Assertions.java:138)
        at app//test.robot.testharness.VisualTestBase.assertColorEquals(VisualTestBase.java:168)
        at app//test.robot.javafx.stage.DrawAfterDeiconifyTest.lambda$redrawsAfterDeiconify$3(DrawAfterDeiconifyTest.java:96)