No matter what I try I can not get the result that I desire. I wish to Face trim the top surface to the fillet edge. I created an extract to act as limitation, but the resulting cut is not correct. projection direction is normal to surface but i have tried all the options. If I try and use the fillet directly it wont give any result.

The top surface is a single Omnipatch 3 x 3 order

I have checked the OmniFillet and it is set to automatic with G0=0mm, G1-= 0.027deg worst case, so it is on the surface.