The fix with with adding planar reflection plane as clipping one wont work with 4.20, since in 4.20 there is a check that ViewFrustum.Planes.Num() == 5 in BuildLightViewFrustumConvexHull function - have you by chance managed to modify that function to take into account that Frustum.Planes.Num() == 10 for reflection captures ? (or I must frap my head around that fishy Edges table to fix this) ? (adding those additional clipping planes greatly improves performance, so I do not want to lose this change)