I checked at the Content Examples Landscape map and I managed to cut a hole into that landscape without problem.
But when I wanted to do the same with my material the landscape (part of it) become black. I am testing stuff in the ThirdPersonShooter example.
I even migrated the Content Examples material to my project but without any luck. It gives the same blackiness.
I also checked this:
but there is no simple material setup with the LerpHeight Node. I have 3 textures only. Maybe I’ll use 4 but not that many that the link has.