Naked edges when trimming surface with closed curve

Hi, I am trying to trim a surface with a closed curve. For some reason I am getting a naked edge on the trimmed surface exactly in the seam point of the curve. I tried rebuilding the curve, replacing that part of the curve, adjusting the shape of the curve, changing the direction of the seam, nothing makes a difference. Any idea how to fix this problem? Thanks!

Normally if you trim a single surface with a closed curve, the entire trimmed edge will be ‘naked’ - i.e. not joined to anything. In addition, if it is a closed single curve, there will be a split in the edge at the curve seam which will show up as a point.

Otherwise please post a .3dm file with an example of what you think is the problem.

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