Duplicated terrains are linked..

I have two duplicated terrains near one another
I need to dig a hole in one terrain, but it digs in second too…
How can I solve this problem??
Thanks…

You need to change the terain data that the second one accesses, easiest way to do that is click on your terrain, Under Terrain Collider,click the Terrain Data value, just duplicate the terrain data and put apply the duplicated data to the duplicated terrain.

11790-terdata.png