[OPEN LOW] Tiny bug? Using copy prefab function for assigning type of room costs money

(screenshot attached)
Screenshot 1: I try to plan the layout of my hospital on grass with just assigning rooms and corridors, etc. (no foundation, floors, walls, nothing).
Screenshot 2: When trying to use the copy prefab function to duplicate it, it costs money. Why? I didn't build anything.

Basically all I'm trying to do is creating a blueprint of the hospital with similar office buildings.
It's not a big issue but would be convenient, when I try to duplicate floor plans with same layouts.

Hi, this is a nice catch - the cost actually comes from copying the floor/ground, let me see if we can easily add a check that will prevent paying for tiles with the same type/material.