Lightmass: multi-bounced sky lighting

[Situx]

The black shadow in corners is due to too much biasing by Lightmass when tracing gather rays. With point and spot lights, only the first bounce uses a gather and is affected by this bug, while the rest of the bounces come from photon mapping which is not affected. With multibounce skylight, all bounces are gathers and are affected by this bug so the artifact is much more noticeable.

This is completely solvable but I just ran out of time for 4.18. It’s high on my priority list.

Any known workaround? Any tips of settings combinations to avoid for 4.18? If it is on gathering, is it correct to assume the more bounces in NSLB the deeper the effect of the bug?

Thanks!!!