Collision hit event doesn't work

I created an box collision, when it will hit the ground a landing system will run.
this is the collision setup

and unless I turn on simulate physics it doesn’t work. The problem with simulate physics is that the collision is fall down and does’t move with the character.
Few months ago I created this system in UE4.8 and it worked perfectly. Now I tried this in UE4.11 and UE4.12 and it doesn’t…

this is the landing system:

Any idieas how to fix this?
Thanks for help!

I added these nodes and it works now. (I also tagged the ground with tag “Ground”)

But I still want to know other way to do that, because in 4.8 it worked perfectly.