It seems the processing of the contours by toposolid finction is having trouble finding the "edge". The contours along the long edge are very long and maybe are composed of arcs, it is hard to tell. either way the edges of the toposolid element are very complex. There are also very few points along those long contours on the edge. This is leading to weird cut in edges and "valleys through the toposolid. You can see the strange edge in green and how there are very few points to work with here.

By just editing the sketch of the toposolid and replacing the long edge with one big arc, it starts to clear out most of the weirdness. I think if a few more points were added, it would get pretty close. So there is some manual work that needs to be done here to get it closer to what you need. Here it is with just the one change to the sketch edge.

I am not surprised this worked better in 2023 with a toposurface element. Mostly because a sketch edge of the element was not needed. Points could be projected and the edge was just a function of the points position. Here the edge is harder to find.
Jeff Hanson
Principal Content Experience Designer
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