Are you sure the call to ARWallTile::StaticClass()->GetFName() is giving you what you want? I use Asset Registry heavily in my game and I usually just hard-code the names of the classes I want to find. I’ve noticed that Asset Registry wants the class name to be the name of the class without the “A”, “U”, “S”, “F”, etc prefix.
So since you’re looking for all assets of type ARWallTile, pass in the string "RWallTile" into the asset registry call. That’s how I do it in my game and it works fine.
Though, I do have issues with asset registry and standalone builds of my game. You may want to make sure the assets you want to load are actually being cooked and packaged when you ship your build, otherwise you end up with