We don't have such a list, sorry. If the USB sound card works on RPi OS, then it will work on LE, too. So check RPi OS forums, who have larger audience.
First Sound Card arrived yesterday:
An El Cheapo noname device. Unscrewing revealed lots of cold solder joints 
and an CM6206-LX Chipset.
Plugged into PI4 - and it "kind of" works. Full 6 Channel Output - but after plugging the card in, my wireless keyboard and 360 controller ceased to function.
Looks like there is an severe hardware/firmware issue with the USB Chipset of the Pi4. Searching revealed, that this seems to be an known issue which hasn't been fixed yet.
I don't expect the other cards to perform any better due to the mentioned USB issue. Are there any known 6-Channel HiFi HATs available? Maybe good question for RPi Forums 
That's good news, because the driver exists for your new device. 
We have success stories for other USB sound cards, but a 6-channel one is new to me. So yes, other RPi forums are a good idea.
Use a fast, blue USB port for the USB sound card. If the issue persists, post a log.
I have a Asus Xonar U5, works like a charm
Please check the RPi PSU for enough wattage, or use a separately powered USB hub. Also have a look at the logs. Generally be analytic before sending stuff back.
PS: Be sure to test new hardware with a stable LE version. If you test hardware with nightly / alpha builds, you'll have trouble to identify mismatches.
