Hi @chafouin ,
only sobol and dithered sobol support light groups officially for now. Most scenes render faster with samples halved and AI-Denoiser than with adaptive sampling and AI-Denoiser anyway. This is mostly due to the fact that AIs are trained on sobol and that adaptive sampling is only speeding-up rendering when the scene complexity is very variable across the frame. As NLM is nearly not used anymore, I mostly test builds with sobol (activating adaptive sampling silently switch to PMJ).
On top of that, light groups are most of the time useful in the lightning setup phase only, which can now be done in the viewport (and where adaptive sampling is not available). When you are done with your light setup, you can apply the strength and tint and use adaptive sampling. So the priority to make both compatible is currently low.
If it really helps in a production scenario and is superior to other available techniques, I’m ok to investigate. Could you please provide such a case (per message/PM if you want)?