When playing in viewport, the user is not able to see the collision of a mesh marks as hidden in game if they run the "Showflag.collisionpawn 1" console command.
1. Open the attached project
3. Run console command "Showflag.collisionpawn 1"
4. You can't see the collision for the right cube
Expected result: Even when the mesh is hidden in game, if the mesh does have collision, the collision would be displayed using Showflag.collisionpawn
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-51518 in the post.