Terrain replication issue

When you want to change only the assignment of textures in the terrain
If you duplicate and copy and change only the texture assignment
Even the copy source data is affected and the allocation changes
If you want to change only the texture for each scene
do you know how?

Also refer to this method to change the terrain assignment and
I tried changing the layer properties,
affected

do you have a sample scene you could export as a .unitypackage and post here? I am interested to see what is happening.

Thank you for your reply.
A sample looks like this:
Layer properties are linked
(Via storage because the file cannot be uploaded large)
https://xfs.jp/gGQ0xR

*Install from package manager
URP and terrain not included

8540294--1141055--layer.png
8540294--1141058--terrain.png