hmmm never heard this issue. This is likely more due to the quality of the receiver or tv speakers. ohhh actually this is likely a bug with the surround setup. depending what you have installed on your xbox, some of the software for surround is in a non final state. What do you have setup?
I have the same setup for the XSX and the PS5 (different from PS4 Pro, Switch, and Wii U which go straight to the AVR).
XSX and PS5 (both on the latest FW) connect to the LG C9 on its latest FW with the provided HDMI 2.1 cable and for both I have no problem with 4K@60 Hz HDR at full RGB bandwidth and 4K@120 Hz with YUV 420 (or 422 need to check). The other consoles connect to the AVR directly.
The TV uses an HDMI 2.1 cable (not needed, but I got the cables after I updated the TV, so replaced some key connections a good while ago) to connect to a Denon AVR-X2300W (on its latest FW) which connects to carefully selected (thanks GAF) Q-Acoustics speakers in a 5.1 setup, selected to ensure no output impedance mismatch, using full copper core thick cables and a dedicated extra shielded cable for the LFE / subwoofer.
XSX, PS5, and the TV when I use the DV enabled Netflix, Disney+, and Prime (HDR10) apps uses HDMI ARC to output DD 5.1 or DTS 5.1 bitstream audio to the AVR.
Again, this never happens on any other console ever (not on PS5 nor on the TV built-in streaming apps)... and, again,
it does not even happen that frequently on the Xbox UI dashboard and I have never noticed it in games at all. I did some research and while it is not hugely widespread it happens to other people just that it is not a major issue and seems limited to the dashboard or when the system starts up (even more of a rare scenario). Issues seems to be the hand shake between XSX and the TV or some internal issue (again, not the first time I experience that kind of issue on a PC or laptop). I have not downloaded the Dolby ATMOS app on XSX (until I have either an HDMI 2.1 receiver or one with eARC I have no use for it not the speakers lol for these consoles).