Nanite supported static mesh collapse in Procedural Foliage

Dear someone.
I’m using Procedural Foliage. It works fine while I’m using static mesh, but
when I turned on nanite support for the static mesh. It collapse.
Does anyone know how to avoid this?

-env-
UE5.1
C++ based project
Win10

nanite support off
image

image

nanite support on
image