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As an observation, in case this is useful to anyone, it seems higher GI values are needed to get rid of splotches when using IM prepass + LC.
Where previously 45 (IM) 30 (interp) + 1600 (LC) used to be enough, now we are getting GI noise. I haven't tested the minimum values to avoid the noise, so I just go 90 (IM) 60 (interp) + 2500 LC, which might be a bit overkill but seems to work fine and hopefully doesn't add too much extra time on the render.
Where previously 45 (IM) 30 (interp) + 1600 (LC) used to be enough, now we are getting GI noise. I haven't tested the minimum values to avoid the noise, so I just go 90 (IM) 60 (interp) + 2500 LC, which might be a bit overkill but seems to work fine and hopefully doesn't add too much extra time on the render.
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