blend & planar sections

 From:  simba
7036.1 
Hello,

I'd like to blend two aerodynamic shapes using blend + planar sections. I did the same (see picture) with similar shapes in the past and it worked fine but this particular version doesn't work for some reason. I assume it's related to the fact that the edge at the lower cut is broken into 3 lines at the very end.

How can I fix the problem?

S.
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