Grasshopper Evaluate Surface component does not preserve tree paths

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Why are the paths {0} and {1} not preserved?

Why can’t I use Shift Paths component to unshift them?

I can not replicate that using Version 6 SR24 (6.24.20079.23341, 03/19/2020)

I guess they are not shifted, you need to Renumber your tree:

Have you tried to set the Surface input as Principle?

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You can use [Path Mapper] to replace the [Shift Paths] problem.

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