Hi Ivan @cloudsvisitor77,
the MeshSplit command in Rhino 7 WIP is a new command. It’s being worked on, as explained here: New Mesh Intersection Milestones.
I think I know what’s going on. The inconsistency is due to something I am currently working on, called “the problem of resplit”. Once a mesh has already been split by a command, splitting it again gets even harder. If you run the _DeleteMeshNgons command, you’ll see the newly created ngons of the previous split. But something is not right here.
My guess is that you split the mesh with only ONE part, then tried to split it with both.
I would like to understand better why the split failed in the first place.
Do you have the model before the first split?
Thanks,
Giulio
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Giulio Piacentino
for Robert McNeel & Associates
giulio@mcneel.com