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[latent elbow]

you want to take a look here

https://create.roblox.com/docs/reference/engine/classes/Terrain

you could use CopyRegion & PasteRegion to copy and paste terrain

or you can use ReadVoxels & WriteVoxels

[latent elbow]

That event tells a actors to load a chunk

But the terrain script keeps track of what chunks have been loaded or unloaded