I have started working with the static Brep method, CreateDevelopableLoft. In general I have been getting good results but for some reason these particular curves are failing to generate a Brep even though the DevLoft command does so perfectly fine. I’ll attach the sample file containing the two rails and the sample command.
That’s because of a bug here. It’ll be fixed soon
I don’t see issue 49730, but I’ll take your word for it that you’re working on it. Many thanks and have a great weekend!