I actually tried that, when I put there ECC_GameTraceChannel 3 or 4 or 5, it indeed does collide with my collider. I assumed that since they are not defined, they use default response to block and hence I see the collision. I am going to test if some of those matches the exact settings I have in my trace channel. By the way, are you aware maybe of some way to convert the c++ enum ECollisionChannel to channel name that is defined in editor? Or is the only way tedious trial-error checking if something matches the exact responses.