Unexpected Sweep2 result

In the attached, if I attempt a sweep2 I get what I would consider an unexpected result in v6; v5 results in a sweep I would expect. If I use the point option I get the correct result, but as one would expect it is no longer a simple sweep.

OddSw2.3dm (376.6 KB)


Thanks, filed as http://mcneel.myjetbrains.com/youtrack/issue/RH-30321