I can confirm that I also am having this issue. I recently bought a new Macbook Pro and when opening the copy of Audacity I had on my old computer, it would crash when I tried recording anything.
I downloaded the latest copy, 3.2.3, and for some reason my Blue Yeti microphone would stop live monitoring as soon as I hit record, even though my headphones were plugged directly into the microphone. I tried downgrading to each earlier version and the problem persisted until I got to version 3.1.3.
Not sure why this would be, downgrading worked but hopefully will be fixed in the future.