Hi Nick, those are bugs - it isn't very reliable I think with closed curves or when it would have to cross the seam edge of a closed surface.
It's something that I hope to get fixed up in the future when I get some updates to the geometry library that I'm using.
You may try doing something like splitting your closed curve into 2 halves and then try it.
The directional type projection is far more reliable.
- Michael
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