I recently got really annoyed, that Maps/drive on the N9 has some strange bugs related to rendering map data correctly. This gets especially annoying in connection with navigating as suddenly highways stop at a tile border and the routing fails due to that.

I have installed around 10 country maps for offline usage and sometimes (more often recently) I notice that map tiles aren't rendered for certain regions but only for certain zoom levels. I guess this is a bug... see following images for Italy. Have you experienced the same?