The new inset command for Rhino8 can ignore seams, but not tangent edges.
If you make a cube, with a big fillet and run the inset command and select select the fillet surface as well as the surface in the top and bottom of the fillet, then the inset command only makes individual insets for each surface, not all faces as expectet.
I guess the programmer forgot this situation during development.
Regards
Leif Rosenbæk