[41.78.16] [Singleplayer] Zombies just disappeared when I reloaded the save

[Unamelable]

	• 41.78.16
	• Singleplayer.
	• Host.
	• Mods don't change info about zombies/their behavior
        • This is the second time this has happened

I don't know what could have caused this, but as I prepared to clear the next zone in Louisville, I had to leave the game for a while. When I walked in, the zombies inside the massive building simply disappeared. When I move beyond the zone where I left the game, the zombies remain.

 

Could this be due to the fact that the game was unable to save zombies in the zone? (When I left the game, the game save for a long time "like a solid 4-5 minutes").