Normal Edit modifier not working properly in game engine

The modifier only works if I do not apply it. When I apply the modifier it still works in viewport but not in the game engine.
In the .blend the left “bush” is the one without custom normals, and the two on the right have the modifier attached.

Can anyone tell me if they get the same problem when they apply the modifier? I followed this tutorial:https://www.youtube.com/watch?v=y8dckLFkIJU

Attachments

Normal_Edit_Modifier_Not_Working.blend (1.2 MB)