Why does MESH trim and MESH split fail - Rhino for Windows

Hi I always have problems with the mesh in Rhino I used the same method in another program, it works fine, but I’m curious, why not fall into Rhino. Rh7-Sp10 trim-stl.3dm (18.8 MB)

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How to Cut An Object in Rhino 7

Hello people of the Rhino3D community. It occurs way too many