I've had tonnes of issues passing through USB devices to UTM. There are SBCs I'm working with which appear as one kind of USB device, then a flashing tool sends a command which makes the SBC disappear and re-appear as another kind of USB device, which the flashing tool then writes an image to. I have gotten it to work in UTM a few times, but it's very janky every time.

having written a usb driver myself while at apple, i wonder if it's the devices, but of course could be the utm wrapper. good to know though...i was wondering.