@spacemanspiff Typically watching movies the Sony’s “sound field” is set to “Dolby Surround” and the AVR’s display shows “Dolby Atmos + Dolby Digital” string scrolling with the Atmos examples. I append some quick pictures about my DN1080 settings:
So, perhaps you can create a small clip from your problem video only containing 2-3 chapters. I could offer to test this here with my environment. Here is a way how you could try to upload such data if you want: [TESTING] Video sample uploader and MediaInfo for OSMC users