I've checked and yes, it does. Is there any way around this that doesn't involve digging up to the surface?
The seed is --6218075277800750635 and the coords are -17,-17 to -32,-32
Nope, still got a problem
I think the mob cap was full...
Happened to my brother. Happens when you quit a world with a crossbow/bow in hand.
I tested in a creative world having no roof and still I got 1 small slime at most in 15 minutes.