Random per Island in a exported max file

Hello,
I exported a max file in some formats and try to import it in Blender.
Is a wicker furniture and I use a Random Per Island in the Geometry node to create the material.
The goal is to have each wicker stick with a random tone variation.
But the result is the following; the node affect to each face and no to each island.

Do you know where is the problem?

Obviously I checked all faces are not islands. Each stick is an separate mesh.

Thank you.

Can you provide a small piece of this model?

Update:
Maybe merge normals will help.


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Oh my GOd!!! Work!! Thank you very much!!

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