Whenever I shape my terrain using the smooth or erode tool with decorations enabled I always run into some parts of the grass floating and not getting removed, these parts of grass are almost impossible to remove without using regions.
This is a different issue that does not relate to the LOD issue thats shown / reported in the replies above. I am still experiencing this issue and it has not yet been fixed. If I zoom very far out and zoom back in the grass still remains there.
I made a random island generator that uses the roblox terrain and sometimes I start finding these random blade of terrain grass floating in mid air. Not sure what is causing this issue.
This still happens. I have a procedural generation script that used Terrain:Clear() when I regenerate the map. It leaves a lot of grass floating. It seems to only happen when the client is lagging, so I will have had to slow down the generation process so the grass goes away.