Graphic raycast not blocked by anything

Hi there.

I have some UI elements in the worldspace which should be clickable. That works with the graphic raycaster component, but the UI should also be covered/blocked if there is an object in front of it.

Whatever I try, the UI element is everytime clickable. Even when I set blocking objects to "Three D" or "All", my cursor act with bthe UI element through everything.

Any hints to solve this?

 

There is also nowhere any good infos about how this works...

Am I the only one whit this problem?