youtube.com/watch?v=udPaWyAoqqQ
As seen here, a sleeping zombie manages to make constant idle sounds. I always had issue with this in the mod version but it’s still there today. It’s not only here as it’s in any places where there are zombies like the “We’ve got hostiles!” chapter where you can already hear the zombie that’s hiding in the vent.
Suggestions to fix is to add delays between zombie idle sounds so that you don’t hear constant zombie gurgling sounds and making it completely silent when the zombie is not agitated.