to me the game has corrupted all savegame I had 5 !! after 100 hours of play, this is a serious problem to be corrected immediately as the crash scattered the map
I have around 25 hours of play now..and had 1 corrupt game . lost 2 hours to make it up.
but yes, I have seen 1 corrupt game on xbox 1 so far. even I am doing multiple saves...once bitten twice shy.
The game save will corrupt the most recent save if the game is shut down without pressing the "Home Button" and quitting the game before powering down the Xbox One.
I first quit out of Fallout 4 to the main menu, then I quit the game properly from the Xbox Home screen. This method has guaranteed no more corrupted saves for me.