Importing terrain currently overwrites existing terrain. Any work arounds or fixes?

As you can see in the screenshot I took, I imported this terrain and I’m noticing that it overwrites the terrain that was already there. I outlined the bounding box of the heightmap importer in red.

Below is what it looked like without importing to give clarity of what I’m talking about.

Another example.

I remember using heightmaps before and this overwriting wouldn’t happen at all, they would just be added on top of existing terrain

If anyone knows a fix that would be very greatly appreciated thank you! :^)

Import the terrain in a blank RBXL. Export the terrain to your new map and you can spawn it in later via TerrainRegion.