Blueprint Interface issue with collision


I am working on the simple blueprint which when cube is spawned and falls onto the ground, particle effect is emitted on the sphere. The thing is that the first spawned cube hit the ground and doesn’t fire the print string and call the BPI. Second spawned cube hit the ground and fire print string but didn’t fire BPI function in Mover2_BP.

BPI doesn’t have anything inside. it is just simple default one named as BPI cubefall.

I checked collision option of cube and the setting is blocked all as physical actor.

Do you have an idea to solve this?