Poly Brush Mesh Read/Write Access

Unity Engine
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1

Why does polybrush need read/write access for prefabs in the scene even if they weren’t placed by polybrush or modified by it?

I placed some trees and other props with polybrush scatter tool but the existing scene props throw this error when in play mode. I set read/write on the models for the prefabs placed by polybrush. But this one in the error below was NOT placed by polybrush and has no polybrush component on it.

Even if I remove all the prefabs placed by polybrush these errors still pop up.

Not allowed to access vertices on mesh 'SF_Bld_Castle_Wall_02' (isReadable is false; Read/Write must be enabled in import settings)
UnityEngine.Polybrush.PolybrushMesh:OnEnable ()

Not allowed to access colors on mesh 'SF_Bld_Castle_Wall_01' (isReadable is false; Read/Write must be enabled in import settings)
UnityEngine.Polybrush.PolybrushMesh:OnEnable ()