New Apple TV4K Dolby Atmos Audio Distortion on Disney+ App

Have the new Apple TV 4K (had been using a previous model ATV up to now with no issues), and when we try to watch things on Disney+ it will turn on Atmos then start playing with what sounds like a low rumble and white noise over the show volume. (Only appears to happen in the Disney+ app but I’m unsure if any other apps play in Atmos but will investigate further.)

I feel like the system may be trying to send a full 7.1 signal but I only have a 5.1 setup.

Going into the Apple TV settings under Audio Format and switching from Auto to Dolby Digital 5.1 does fix the issue.

But I’m concerned that by turning off Atmos, I’m missing out on the better audio experience. I am aware you can still play Atmos on 5.1 systems and gain benefits over a usual 5.1 audio stream.

Does anyone know how Apple handles the setting? Does it convert Atmos to 5.1 while retaining the Atmos benefits? Should we be changing the audio format manually or is it best to leave it on Auto? Or perhaps this is just a bug with the Disney+ app?