Why is triggerbox colliding wit FPC?

Hi, I have the Problem, that if I shrink down a static mesh (default cylinder) to x:0.1 y:0.1 z:0.015 to get a coin that is simulating physics and adding a collision box 100 100 700 to match the sice properly, setting collision to custom ignoring all and set pawn to overlap, that my caracter is colliding with the box and pushes the coin away instead of setting of the overlap event and not colliding with it.

Tested the same thing with an cube modefied it and it worked…
If I would keep the cube i still need a different material so i could scale it properly… a collider is way easier
But realy what is different??