Logitech 920 or 615, but webcams are sold out everywhere, right now.

using that c920s. works perfectly

Not a hardware solution but it's being talked about today, I wonder if using OBS to capture the video and outputting it to v4l2 loopback with https://github.com/CatxFish/obs-v4l2sink and reading it in zoom that way would be better. Just a thought, hope this helps.

The good webcams are sold out everywhere, so you'll be lucky if you find anything!

I haven't checked today, but on Monday I was able to buy a webcam directly off of Logitech's website. All the retailers I could think of checking were out of stock.

I haven't been able to use my webcam lately because the teleconferencing I use (WebEx and Slack) is having issues keeping up with bandwidth. I haven't even been able to use the On Computer audio and had to dial in.

You can try Droidcam, which allows your phone to be used as a webcam.

I used Logitech C920 HD Pro for a couple years with Ubuntu. It worked pretty well. I cannot vouch for the issue you're mentioning though.

Logitech C270 HD is a cheap alternative that also works quite well, particularly microphone wise. Image is much lower resolution, though.