You were right. I turned off the normal blend and it fixed the lighting again.
So many things seem to act differently between foliage mode and procedural content generation. (You either use one or the other when populating models, not both at the same time.) I did end up fixing the issue in foliage mode but I decided to generate the trees procedurally.
Is there a way that I can submit a bug report about this? I think I know exactly what’s causing this because applying wind was flipped as well in the PCG. I believe PCG is flipping normals and other stuff upside down. I get that it’s still in Beta but someone needs to fix this so it works normally with everything.
Look at the multiply node that’s disconnected. Normally it is required to have the wind gradient to flip so it’s not blowing what’s closest to the landscape.
I’m going to see about multiplying the normal combine with a -1 and see if that fixes it.