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Stencils in CROCO are large, especially for advection: 5 points at least and 7 points if using UP5 or WENO5 (5th order schemes), i.e. 2 or 3 points on each side of the center point. Thus, you need at least 2 or 3 interior points to copy in the outside (shadow) zones. I guess that if you disable cross-section advection, you may succeed with one point since the pressure gradient has a 3 point stencil (not always with NBQ), but that will require a bit of work and testing. For cross-sections, we often use wall boundaries (with free slip) and Mm=1, but in this case there is no flow across the section...