Hello ,
I was unable to find those particular blueprints but I set up two cubes in a project and used those as my two line trace objects, one set to be ignored and the other the target. Upon doing that I set up the same logic you have here and it seems to work correctly. To ensure that the line trace is hitting the Fog Layer and not something else, can you try using the hit result you get from the line trace to cast to the fog layer’s blueprint class from the “Hit Actor” pin? You could just put a simple print string to test it. Also, try setting the Draw Debug Type to Persistent so that you can see where it is hitting.