Adding geometry in SubD symmetry Rhino 8 not working properly

Hello,

I’m using rhino8 and when I use the symmetry tool in subD I can’t add geometry on either side. If I move a geometry it works, but adding a line or even extruding won’t work (I tried both side dark and light one)
I remember being able to do it on rhino 7. Any idea how to solve this issue or is it a bug?

Thanks in advance