another one you could try this
r.Lumen.Reflections.HierarchicalScreenTraces.MaxIterations=4 which fixes shadow issues. apart from that i would say check your material cause lumen doesn’t like how their setup most of the time. good example is the megascan stuff if you see black models which is due to the way they set it up. Also check that the material isn’t blending the ao into the colour lumen hates it and check to see if these are static shadows or moveable ones? cause if its static could be a issue with your lightmaps
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