TryFitCircleTT Not Working As Expected (Rhino Common)

I am getting no change to input circles with TryFitCircleTT, when I am expecting either the same general behavior as the CircleTT Grasshopper Node (albeit with a change in circle center instead of a change in circle radius) or a Circle.Unset if the calculation failed.

How do I accomplish what the Grasshopper Node CircleTT does in Rhino Common (not looking to use RhinoScriptSyntax)?

Thanks!

CircleTT_Issue.gh (7.7 KB)