Hey ,
I’m in 4.8.0 Preview 3. I created a new First Person Template and created a blueprint. I then selected ‘BigWall2’ from the First Person Template and selected ‘replace selected actors with’ where I then selected the new blueprint I had just created. This replaced the static mesh, and the shadow from the wall was left over. I then rebuilt the lighting and the shadow disappeared. The new blueprint that was placed for the big wall is also referred to as ‘BigWall2’ and it has a link to open the blueprint editor beside it.
This all seems as if it’s working correctly therefore, I’d like to clarify with you.
Are you seeing that ‘Box Brush’ is now listed as your 4 walls, because you selected them all at once, and then replaced them with the blueprint? If so, did you notice that the object names that used to be the walls, before replacing them with the blueprints are now the names of each of the blueprints you’ve added into the scene?
From my test on this, I was not able to duplicate a bug where the names did not appear, or where actors were not deleted from the scene. I was also able to see each of the new blueprints added to my scene in place of the old actor shape.
Looking forward to hearing more from you, thank you! 