I've noticed couple strange side effects when a downed PPV self destructs and I'm still on the planet. If I'm in render range when it does, the vehicle I'm flying eventually becomes stuck in place as though the air around it slowly freezes. If I have left render range I get a strange flickering that starts in the direction the PPV went down and eventually becomes all encompassing. In both cases the icon is still on the map but flickering Relogging will fix the issues and remove the icon, but it does make one wonder why they use the self destruct feature rather than simply despawning outside of render range (which I think they do as well?) Is this the only way to remove the icon from the map?