BlendSrf problem Rhino 6 SR15

[eobet]

I posted about this here a few days ago:

Blend surface doesn't blend the entire surface with history update

[GIF] 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 real…

There doesn’t seem to be a solution yet and no bug report was created, I think.