How foliage density impact foliage lighting?

Development Rendering
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1

I currently have a problem with the rendering of my foliage when I decrease the density foliage of the engine sclability system.
in epic mode:
foliage.DensityScale=1.0
grass.DensityScale=1.0

275210-foliagelight1.jpg
275210-foliagelight1.jpg1216×901 469 KB

in high:
foliage.DensityScale=0.5
grass.DensityScale=0.5

275241-foliagelight2.jpg
275241-foliagelight2.jpg1217×899 479 KB

Would anyone know where it came from and how to fix it?

2

I’m now pretty sure it’s a lightmaps problem. I temporarily fixed it by changing the Lightmaps Type to “Volumetric” in my Foliage Type, however this can increase the performance cost.

I hope someone will find a better solution!