Terrain builder is mirrored after mesh import. How to fix it?

Hi there
I recently adapted some previous pg to have a terrain builder and I came up with this solution: https://playground.babylonjs.com/#8QGENL#49 which is working fine
But when I exported and imported the same mesh into the scene, it seems that the plane vertices are mirrored after import. When I modify the terrain, the vertices are positioned in the opposite symmetric side
What is the solution for this?

Looks like you just need to delete the parent after the mesh is imported.
groundMesh.parent = null

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