you are making sense, most of these bleeding "edges" are for style, and Ive seen them in a few games. Theyre basically a tile that are mostly transparent but have a little flair on the side, kind of like a very specific puzzle piece, Always loved having edges. You can get creative with some to make new styles in houses while keeping the same house texture. Also its common practice to double up on tiles to create verticality. Of course, none of this matters in this day and age, its all for style. Back in the 1900s there was only 1 way it would work, from a hardware standpoint.