When performing a split on a closed object, I’m getting odd geometry results. The model is of an acoustic guitar heel portion of the neck. I split it apart into 0.75” heights to be able to cut on my CNC. (overall height limitations) At the position of the split, the front should not come to a point as the overall geometry shows a rounded area. I’ve done this numerous times in the past. The only thing different this time is that I used a patch on some of the curves. Is that what could cause this odd result or is this a bug?
Video: https://youtu.be/k-SUYI8ZPZo
Rhino 8.29.26063.11002
Mac Sequoia 15.7.3