Pursuit of Realistic Cinematic Scene

Thanks guys. @Nigkdo there you go. Unreal Engine 4 - Advanced Cinematic Grass Blueprint *FREE ASSETS* (Updated: 5/6/2020) - YouTube

somehow, shadows are disappearing. When i render it out using matinee, high res screenshot, shadows are disappearing. There is a 5 trees uses Dynamic inset shadow. When i disable 3 of them shadows are coming back. Is there anyone knows how to solve this problem?