So I noticed that while exiting lfs' window by clicking on it's icon, the perspective of the sound acts as if it stops right where it was a moment before exiting (like going in shift U mode) from lfs as said. This however does not happen while exiting lfs window while clicking on another opened program or alt-tabbing.
Here's a video of what I mean (yes it's crap quality but you can hear the bug):
https://youtu.be/hCOsd-wa4Ic