Unfortunately this is not fixed yet in 2.8.0 but I'll try to fix it on the next version. There's also an other bug in tile downloading that causes that sometimes all tiles won't get downloaded and then you cannot select new area to download tiles from (if you try it'll say that "Tile downloading is already in process."). If you get this bug (or want for some other reason to stop tile downloading) you can press and hold the tile downloading icon. It will abort tile downloading and after that you can select new area to download tiles from.