So I’ve been following along on a personal project, but when I replicate your steps to create a moon, disconnect the hdri and crank up the exposure to see the effect of the moon, this is what I get.. Any idea what the issue might be?
That looks new to me, but I bet it’s because of the denoising trying to make sense of very little information. My first guess would be to decrease the Light Threshold under Sampling and Advanced. Does that solve it?