[Tilesathome] Islands at sea that are contained entirely in a tileget inverted

[Alex S.]

D Tucny wrote:
> As far as I can tell, the only difference to the correctly rendering 
> coastline in the area is that in this tile, no coastline crosses tile 
> boundaries... In any of the tiles where there is any coastline crosses a 
> tile boundary, even the smaller entirely contained islands render 
> correctly, if there is no coastline crossing a tile boundary, they are 
> rendering as lakes...

Is the "empty" tile marked as sea?