How do I duplicate a landscape?

So to put it short, I have a level with a lot of very large landscapes (playable thanks to world partitioning and world origin shifting). I want to duplicate the level, but it doesn’t create the landscapes when I do this.

Is there any way for me to duplicate the landscapes individually and move them to the new level manually? Ctrl C + V doesn’t seem to work on them.

Would it be easier to duplicate the whole level and just remove the stuff you don’t need?

When I duplicate the level, it doesn’t duplicate the landscape tiles. It has the names of the landscapes in the world outliner, but they’re empty.