Audio issues with streaming apps (but not Apple Music/purchased movies)

Last night we started experiencing an audio glitch while using the Hulu app. Description and Specs below.

Hardware:

• Sonos Beam plugged into eARC (cables tested and fine)
• Apple TV set to auto-switch audio if Atmos is available.

Issue:

• While watching a show on Hulu it sounds like there's no center channel being processed and as a result every bit of dialogue sounds as if it is underwater or behind a wall.

Issue Presents:

• Hulu and Netflix constantly
• HBO and Amazon on some content

Issue does NOT present:

• For any purchased film/tv or on any Apple TV+ shows.
• Spatial Audio on Apple Music
• Using the Hulu app on Google TV which is built into the television
• Paramount Plus
• SOME content on HBO and Amazon (but I haven't figured out what the difference is between content that works and content that doesn't

Steps Taken

• Completely reboot all devices
• Factory reset Sonos Beam
• Deleted Hulu and reinstalled

I'm pretty sure it has something to do with each services audio stream and how it works with the latest AppleTV update because I can just switch Atmos off on the AppleTV (set it to 5:1) and everything works fine. That said, just turning Atmos off on the AppleTV actually "broke" a film on HBO that worked with the normal settings, but defaulted to the muted sound until I turned Atmos back on.

TBH I haven't had any issues with our AppleTV's in all the years that we've had them, so this issue is kinda surprising.

Any insight into what may be going on here?