Reproduced with Version 2020.1.0a1 (998f3306adcf) Sat, 10 Aug 2019 04:09:09 GMT Branch: trunk

Regression: Does not reproduce with Version 2019.1.12f1 (f04f5427219e)

When Draw Instanced is checked, the terrain is not rendered in in-scene-view Camera Preview (when a Camera Object is selected)

Repro:
1) Create a new Terrain
2) Draw Instanced: Unset (Terrain Settings)
3) Click on the Camera game object in the scene (make sure that the camera is in view of the terrain)
> Camera Preview should show the terrain
4) Draw Instanced: Set (Terrain Settings)
5) Click on the Camera game object in the scene
> Not shown