Grass noise when use WPO


Hello, I just sprayed my own grass with PCG on the floor.
It also applies the effect of the grass shaking by the wind, and the WPO function is not used on grasses far away to improve performance.
However, I see excessive noise on the grass near the boundary where the WPO function is disabled. I’m having a hard time guessing the cause of this, so I’m asking you guys.