more failing tests after rejigging shmmr / rsbsFeatureDistanceModelTest.testFindDistances - flaky ?

New and unexpected fails after patching JAL-4635 - not 100% reproducible on oSX/tahoe or bamboo

Gradle suite > Gradle test > jalview.analysis.scoremodels.FeatureDistanceModelTest.testFindDistances FAILED
    java.lang.NullPointerException
        at jalview.analysis.scoremodels.FeatureDistanceModelTest.testFindDistances(FeatureDistanceModelTest.java:231)

jalview.gui.AlignViewportTest.testShowOrDontShowOccupancy
1-Dec-2025 15:37:30 Gradle suite > Gradle test > jalview.gui.AlignViewportTest.testShowOrDontShowOccupancy FAILED
01-Dec-2025 15:37:30 java.lang.AssertionError: Expected occupancy to be non-null in column 5 expected object to not be null
01-Dec-2025 15:37:30 at org.testng.Assert.fail(Assert.java:94)
01-Dec-2025 15:37:30 at org.testng.Assert.assertNotNull(Assert.java:406)
01-Dec-2025 15:37:30 at jalview.gui.AlignViewportTest.__CLR4_4_1lfq8443us9(AlignViewportTest.java:478)
01-Dec-2025 15:37:30 at jalview.gui.AlignViewportTest.testShowOrDontShowOccupancy(AlignViewportTest.java:446)

these both involve alignFrame operations .. definitely race conditions affecting previously happy balance of GUI tests.