Wrong seam

There is some confusion, there was a seam, I change it, then I use the Divide and the old one (the previous seam) is shown here. After dividing it is clearly seen that the tool used a real seam. What is it like?
2018-11-04_190857
Untitled.3dm (30.7 KB)

Hello - - use the ‘Natural’ option on the seam location, not Automatic. It looks to me like Automatic should choose the ‘Natural’ location when there is only one curve, but currently does not. V5 does the same thing, I’m not sure if that is by design or not.

-Pascal

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Well, although I think the seam should be normal by default.