rille

Me and my friend have been getting back into 7 days to die recently. However, we have came across an interesting quirk of the game that we have only encountered somewhat rarely (2 or so times every 10 days). In this event, every zombie that spawns in is feral, and mysteriously de-activates/despawns in the morning. We are on the highest difficulty setting, so we are wondering if this is an unknown feature or an unreported bug. Thank you in advance.