this isn't about the undead's heads disappearing after 5 minutes or anything, i've never encountered that while playing on xbox one. just wanted to see if anyone else encountered what i'm about to write
so basically, i once had all survivors in MacFarlane's Ranch alive. when i went back to the ranch a few in-game days later, there were no survivors. thing is though, is that the town was still declared "Safe" on the map, and there was no indication that the ranch overrun.
so after a few in-game days, i saved my game. when i reloaded, i got a notification that said "MacFarlane's Ranch is lost". when i went back to the ranch, it was overrun. naturally i saved the ranch, but i don't understand any of the events that led up to this.
this also happened to me before as well, on xbox 360. when i went to gaptooth breach once, there were no survivors. however, the town was never lost so idk about that.
if someone else had this problem, please comment down below