Continuity at transitions

When using the Length option to obtain a drafted surface, if two base curves are not plane, the transition corresponding to their connection on the opposite side of the sweep surface can have tangency or positional discontinuity depending on whether you respectively had tangency or positional discontinuity in the connection point.
The illustrations below display two cases in which you get discontinuity when using the Length option:
  

A rectangle has been sweeped in a direction not perpendicular to the plane. You had positional continuity in the base contour, but now you have positional discontinuity on the "top" contour.
The reason is the faces are trimmed around transitions.

A rounded rectangle has been sweeped in a direction not perpendicular to the plane. You had tangency continuity in the base contour, but now you have tangency discontinuity on the "top" contour.