I have checked the last build but it seems that is behaving the same with nurbscurve:
But in a case without this issue, like for example an arc …
…It seems that we can get directly max and min x y coordinate. But for obtaining the max and min points we need to do some additional steps. Or maybe am I missing something? The bounding box allows to make some tasks in a really nice and natural way, so I am quite interested in knowing possible related workflows.
By the way, I just uploaded to the package manager a node with the last solution I proposed. So no need to deal with code