I had a very mean thought today. When someone is subjected to a flesh to stone spell , they are not dead. Since they are not dead, any attempt to resurrect them will automatically fail, as well any attempt to speak with dead. As I found out in a previous question, it can be difficult or expensive to discover if someone is alive or dead.
So now that the person is neither alive or dead, how do divination spells target them? What happens if you stone shape the statue into small pebbles which are then scattered across the world or even planes? At what point is the statue considered dead then?
With all of these steps, it should be next to impossible to save someone short of using wish to gather up all the stones, then reassemble them into their correct place, before finally casting stone to flesh. Or could you just wish for the person to be dead and then do an easier resurrection?