Why invalid BREP

I have some complex geometry I am attempting to panelize using cubes. 27 out of 28 surface are fine, but the 28th one is invalid. I can preview the geometry. It looks correct, but it refuses to bake.

I unknow that I’m not the first to create an invalid BREP when doing trimming on complex surfaces. However, I never understand WHY its invalid, especially if preview geometry can be created.

Is there a way to see WHY grasshopper considers a BREP invalid? Are there components I can use or tests I can run to learn what is going wrong?

Use the Null Item component to see a description of the error.

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