Why my Terrain is disappearing after saving as Prefab

Just updated my version of Unity to 2018.3.0f2. Pre-date Could just save the terrain. But now, as soon as I create a prefab and try to reload it in. It simply wont appear. It is still an object in the assets folder, but cant modify it.


Appears the creation of the terrain doesn’t create any Terrain Data?

Had to do with the scrip I was using. I use the Obj2Terrain Script, and just never had this issue before. Had to export height maps and some settings. Create new terrain and import. Solved