Was exploring vale of shadows... all zombies and skeletons had the same sound effect when discovering the player and dying as if they were spiderlings.
Also experienced several game crashes during testing, most of which occurred during navigation of any menu or interacting with objects. Some crashes experienced in combat with high mob density. I experienced no crashes during traveling on foot, not sure about horses because 4 hours in still haven't seen one.
Also not sure but just having a campfire in audio range or on screen seems to increase likelihood of a crash. But as I said the vast majority of crashes I experienced was inside of a menu, happening much more frequently from other tests. I crashed about 7-9 times.