What do you mean not finished, of course it’s not finished. But with the gutter, they had to orient themselves on the neighbor. He probably has different tile dimensions than your tiles. So I assume that a transition sheet will be installed there. Another whole row of tiles definitely won’t fit there. I also don’t think the tiles are cut. Therefore, only a transition sheet remains as a solution. Take a photo in the light of the entire junction. It would be interesting to see how it looks in the light.