Folliage shadow issue

Development World Creation
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1

Hi, I’m having an issue with the shadows of my folliages, as you can see on my screenshot, there is some square where the trees have no shadows.

Do you know how can I fix it ?

Thanks

image
image1287×540 60.3 KB

2

I discovered that my problem comes from the Virtual Shadow Maps.
For the moment except change my project in shadow method “Shadow Maps” in my project settings I don’t know how to fix the issue.