Ambient sounds disappearing in Miami level

I’m about 8 hours into the game and have noticed that background sounds disappear after exiting a building or any other enclosure. I’m only left with 47’s footstep sound.This happened to me a couple of times. Reloading fixes it temporarily.
E.g.

  1. Crowd chatter, race car sounds, music from the event go missing after exiting the basement garage.
  2. Sound of the sea goes missing near the pier area.

(Hitman 2 Gold edition, on Steam, Windows 10 v1809)