I don't know how "popular" this bug is but I had it since the first early access version. At the western part of Cyseal, the part where it constantly rains, many sounds are missing. E.g. the sound you make when chosing flare and the sound it makes when it gets shot.
Whenever I'm in Cyseal or anywhere else though, I don't have that problem.
video to show what I mean:


Spiegelberg! He, Spiegelberg! Die Bestie hoert nicht.