You clicked on the actor hoping for a landscape trace. The actor is set to ignore the trace, so it is not detected. The trace continues on to the next entity, which is the actual landscape. And then the trace detects the landscape.
If you set the actor to landscape > overlap, the trace will detect the actor and continue on to detect the actual landscape. Set it to landscape > block and the trace will detect the actor and will end at the actor. Block is probably what you want.