I don't have Big Sur handy, but one trick for funky MIDI issues is to unplug your MIDI devices (including the interface and all USB MIDI tidbits), go into the Audio Midi Setup application, open the MIDI Studio (command+2), and delete all of the devices you can - ensure that you can at least delete the Rev2. Then, reconnect everything and see if they all show back up. If they do, then the USB is recognizing it properly and it's an issue with the DAW. If they don't come back in the MIDI studio view, then the system is failing to see them as a MIDI object. Note that only devices with a native MIDI interface (e.g. USB) will show up - stuff connected to those interfaces via DIN will not, as they are just traffic on the interface from the OS's perspective.