Hi,
Yes, had suspected same as you note, as i tried to get something viable with it.
Got IES disabled & found the other missing feature that's causing error in this case - textures on emitters.
Also there are no light/emission material nodes and lots more to do.
Am checking & correcting this scene as is ready & freely available, to give back in hope there will be some more exposure, help and testing on the way. Since things are going slow on the front, yet do look promising.
As there's no IPR in SA, got set @24 samples + pinch of denoise. Fast preview...