Mesh split/difference/intersection won't work

Hi
I tried to split the meshes with one another. Both are single closed mesh, and all the componnets of the split/dif/int arn’t red, but the result is empty.
does anyone know what the problem is?

Hello
I have the same problem

and there are many post with such problem. I understood that with Rhino7 (6?) this code was rewritten and is more reliable.
I think there are more options in Rhinoceros. So you cant test on Rhino.

Also when you find a bug it is best to post the file and your system information.