Question DrawInstanced terrain with scneVIew.SetSceneViewShaderReplace(..)

Hello, I am working on an editor tool where you can use the

sceneView.SetSceneViewShaderReplace(..)

method to render a whole scene with a single shader.

However, I am running in to an issue where terrains with

DrawInstanced

set to

true

become invisible when rendered with the custom shader.

Any insight in to why, what

DrawInstanced

is doing, and how to support it would be great, thank you!