Сropped shadows in landscape level

Development Rendering
#1

howto fix this problem? and why it happens?

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268055-%D0%B1%D0%B5%D0%B7%D1%8B%D0%BC%D1%8F%D0%BD%D0%BD%D1%8B%D0%B8.jpg2560×1440 825 KB

#2

Did you rebuild light?..

#3

Yes, of course.