Zebra isssue in WIP

I noticed Zebra is only visible on one of the sides of a nurbs surface in the WIP version.

Is this by design?

Do you have backface colours activated? Because with a dedicated backface colour zebra analysis doesn’t show in older Rhino versions either.
Without “color backface” checked my WIP is showing zebra.

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That had to be it. Lately, I was playing around with subd and turned this on.