Does the gameobject brush create tiles when painting on a 2d Tilemap?

I have a tilemap that uses the gameobject brush to paint 3d tiles. I want to use the Tile data type to easily check and modify neighboring tiles, yet using the GetTile() meathod always returns null (Casting as either a tilebase or a tile). I have a suspicion that the gameobject brush only paints and centers gameobjects to the grid, not using the majority of the tilemap features. Can anyone confirm this?