
An update has just been released. Thanks for reporting the bug with animals being heard inside buildings. That was a strange one. It appears that the game still plays the weather in the background when you are inside cells, so any sounds linked to regions also play inside. After checking why Skrim's wilderness sounds don't play in interiors, I noticed that they all had the "IsInInterior" condition set to zero.
So The Wilds' sounds now have this condition, preventing them from playing in interiors.
Thanks for the feedback people!