So this is what you’d expect, a bunch of hits that make impact with the cube correctly.
Then I dragged the cube 200 units on x and clicked a bunch more times. Notice no successful hits on the cube but the old location still successfully reports a hits floating in mid air.
I’ve also submitted a related issue as a separate bug here https://answers.unrealengine.com/questions/207100/473-actoractorlinetracesingle-doesnt-work-correctl.html There is some overlap between these 2 problems it seems.