Center channel on some content missing on my Apple TV.

Just bought and enabled this device: TV 4K Wi-Fi (3rd Generation) + Siri Remote + Power Cord + Apple 1 Year Limited Warranty (128GB WiFi + Ethernet). I am currently using Wi-Fi. My service is @ 70 MB data rate.

The AppleTV is connected via HDMI cable only to my AVR which is connected to my TV. Video works fine. Dialog on center channel is present on some content, not present on some content, disappears on some content. As examples, dialog is fine on Ted Lasso, Shrink. Not there on Silo, Instigators. Disappeared with 12 minutes remaining on Wolfs. The home page trailers also have the problem. Turning off/on components in the system did not clear the problem. Audio set to Auto / Atmos Available.

What is the fix?

[Re-Titled By Moderator]