Decals in Cycles show black transparent background

Hi People, i have issues making decals, does anyone know why i see that black transparent plane in cycles? It is just a plane with alpha map. I think it is the shadow coming from the mesh casting in to the other object because as you can see i have other decals on the left hand side which renders correctly.

These are my settings
Ray Visibility > Shadow Off
Blend mode > Alpha blend
Shadow mode > none

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