Hi! I'm trying to make very simple scene with flip objects collisions, but they goes through any object, like my file, or test geo, or even ground plane. I've cheked a concave type for collision for any colliding model but it always goes through. Maked a ground plane but same result. So why it happens? Thanks.

Check your merge node, by default the left inputs affects the right inputs. Either set it to affect mutual or, more common, wire your collisions left of the solver stream.