Has worked fine is Sideband since the very early days, as far as I'm aware ;) Plug in the RNode over USB, allow permission for Sideband to use the USB device, and make sure "Connect via Bluetooth" is disabled in the RNode hardware settings in Sideband.
If that still doesn't work, it may be because the specific device you're using has a new USB vendor/product ID that's not included in the filter list. Sideband uses a VID/PID filter, so it doesn't try to open all kinds of non-relevant USB devices.
You can plug in the device on a linux machine and use lsusb to get the VID/PID, then post it here, I can check if it's in the filter list.