I understand that the rebuild (with increased complexity of the surface) is expected behavior (any way to retain the original complexity, btw?*) but I don’t understand why it no longer blends the entire surface edge.
That last part though, I really hope is a bug. Is it?
And even if it’s not considered a bug during the implicit history update, even doing an explicit “blend edit” doesn’t reset the blend surface back to cover the entire edge, and I saw no option for it either, which I really think should now count as a bug.
** fun fact, retaining the original complexity of surface rebuilds on history is something that Autodesk charges 5000 euro per year for, because only the two most expensive versions of Alias has it…