Does Frustum and Occlusion Culling work with Instanced Static Mesh (ISM)?

I had done some tests with Instanced Static Mesh, and I’m not sure if the meshes are being occluded correctly or if I’m doing something wrong.

Basically I’m testing creating a terrain with blocks, but when using FreezeRendering all meshes still seem to be rendered. I know that HISM handle culling better, but I just wanted the simple frustum culling where ISMs outside of player view are not rendered. Which I’m not sure are occurring since with the FreezeRendering all meshes still seem to be on screen.

As you can see the bounds are calculated properly for all the “chunks”

Ok, actually found the “problem”, it probably was culling properly, but with nanite. When disabling nanite it culls properly, well kind of.