I see what you mean. I’d lean on the test visualizations then to see what may be different. Look for visualize.lumen.indirectdiffuse (or something close to that) and it will show you the indirect lighting in your scene, might help you diagnose. Also the afformentioned lighting and reflection only, it vaguely look like you might be dealing with sky occlusion. Why RT shadows would clean that up I cannot fathom, as the shadowing methods aren’t that deeply integrated with lumen as a whole, at least not in a way where I’ve ever seen this behavior before.
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