I created a new world recently, and went exploring in Spectator mode to find a suitable spot to set up camp. As I was zooming about, on the very first day, not 200 blocks from spawn and only 2 minutes of exploration, I spotted a village. Upon investigation, I found that the entire village was actually Zombie Villagers.
I figured this was weird, (though obviously a thing in-game, since... well... there it was), but after a little researching, I couldn't find anything about this phenomenon.
What are the chances of this actually happening?