Thanks for posting wielkiczarnyafgan!
I was aware of the strong reflections and have fixed that for update 2 (still awaiting epics response for update 1).
The flickering is an that after returning to the project I have noticed as well. It can be fixed by going to your main light source and turning off shadows. That gives a great result to the grass, but isn’t a great solution if you’re using a directional light with other meshes in the scene (most of you probably are). The next best thing to fix the is going into your foliage settings and turning off shadows. It gets rid of the flickering but doesn’t have that nice AO you can see in the picture below. I’m going to see if there are any other workarounds to get the best of both worlds.
I have also implemented the baseline color changes based on world coordinates (as you can see in the previous images) as well as far better wind . I’ll upload a video soon to show it in effect.