The system test CustomSecurityManagerTest fails on a Mac M1:

CustomSecurityManagerTest > testFullScreenAfterPermissiveSecurityManager FAILED
    junit.framework.AssertionFailedError: expected:rgba(0,255,0,255) but was:rgba(0,0,0,255)
        at test.robot.testharness.VisualTestBase.assertColorEquals(VisualTestBase.java:183)
        at test.robot.helloworld.CustomSecurityManagerTest.lambda$doTestFullScreenCommon$6(CustomSecurityManagerTest.java:203)

CustomSecurityManagerTest > testFullScreenInitPermissiveSecurityManager FAILED
    junit.framework.AssertionFailedError: expected:rgba(0,255,0,255) but was:rgba(0,0,0,255)
        at test.robot.testharness.VisualTestBase.assertColorEquals(VisualTestBase.java:183)
        at test.robot.helloworld.CustomSecurityManagerTest.lambda$doTestFullScreenCommon$6(CustomSecurityManagerTest.java:203)

CustomSecurityManagerTest > testFullScreenInitNoSecurityManager FAILED
    junit.framework.AssertionFailedError: expected:rgba(0,255,0,255) but was:rgba(0,0,0,255)
        at test.robot.testharness.VisualTestBase.assertColorEquals(VisualTestBase.java:183)
        at test.robot.helloworld.CustomSecurityManagerTest.lambda$doTestFullScreenCommon$6(CustomSecurityManagerTest.java:203)

CustomSecurityManagerTest > testFullScreenAfterNoSecurityManager FAILED
    junit.framework.AssertionFailedError: expected:rgba(0,255,0,255) but was:rgba(0,0,0,255)
        at test.robot.testharness.VisualTestBase.assertColorEquals(VisualTestBase.java:183)
        at test.robot.helloworld.CustomSecurityManagerTest.lambda$doTestFullScreenCommon$6(CustomSecurityManagerTest.java:203)

This is because we are trying to sample too close to the edge, outside the visible screen bounds (it is a full screen test). Since all we care about is whether ot not we went into full screen, the easiest fix is to move away from the edges.