There seems to be an issue where Roblox Terrain merging between its different materials is happening differently in studio to how it occurs in the live-version of the game.
I’m not sure if this a newly enabled feature or a bug.
Game:
Beta Features:
All
Expected behavior
As you can see, the terrain looks perfectly normal in the live-build of the game.
The terrain does not have odd outlines where the terrain is merging in the live-build but does in the studio build.