Inconsistent Results with Sparrow Ceilings.GetGridCurves

Does anyone have recommendations for why the Ceilings.GetGridCurves node in the sparrow package inconsistently seems to miss grid lines?

It seems like it has something to do with elements like Lighting Fixtures and Air Devices that cut the ceiling but it doesn’t always have the omissions.

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Sparrow notes itself as being open source, but i can only find the Youtube page with no other links. Is there a github for this package?