So I've been missing sounds as well, however I've discovered a way to make some of them work again, but only briefly. While in big game hunter I got angry with a spawn and decided to home teleport out. It was then I noticed that my teleport sound fx (15 year celebration) was back, however my woodcutting was still missing, or at least part of it. I got a sound fx for the logs getting into my inventory, but not the hacking of the tree. After I left big game hunter my teleport stopped making sounds. I then decided to keep trying in different instances to see if other sound fx would work again. If you start a floor in dungeoneering, but then leave before completion, your first swing with a hatchet will make the wc sound fx. After that it goes silent. Mining or Divination sound fx didn't do anything with this test. I haven't noticed a change with boss instances and sound fx. I did however find that sometimes randomly I'll get 1 sound fx out of the blue. I was woodcutting for science and got nothing. I decided i'd finish out the elder tree before moving on. Mid way through the time I got one loud hatchet sound blaring into my headphones, then nothing.
I thought at first that perhaps it was my sound card but it's great to see others with similar issues as i have no mining sounds or combat sounds period which is more than off putting, hope these issues get fixed soon.