Perhaps tone down the emissive a bit, low enough so it doesn’t make the lit areas glow but high enough to remove pitch black pixels in the shadow. Try to find the middle ground between the two kind of ugly.
Or you could try to use the new light channels. I haven’t tried this so I’m just speculating but if you could make a faint, shadowless distant light which only affects the grass then that would help too. That “grass filler” would provide subtle directional lighting even in the shadows of other lights.