VrayInstancer filtering in zdepth pass

[Raven]

When using VrayInstancer even if I disable filtering, the VrayInstancer objects still antialias in the Zdepth pass.
They seam to not filter if they overlap with non instance geometry, but still filter when overlapping other instances and empty space.

[svetlozar.draganov]

This works fine here. Would it be possible to send us a sample scene along render output from Zdepth pass for investigation?
What are the versions of V-Ray and 3dsMax that you are using?