Lines between tiles at fullscreen

So I noticed that blank tiles, when in fullscreen end up with lines appearing between the regular tiles and the blank tiles.
I saw a few posts from a few years back but I got the impression this was fixed.

Does anyone have the same problem, and if so, how did you solve it?

I find that if the tiles are the same or similar, but on different layers (tiles on the same grid box), that can cause tiles to show a line.. I sometimes have to add tiles to other layers to remove the lines.. or move all tiles to the same layer.