On Linux it steals/hogs the hardware MIDI, so you can't connect to it with other JACK MIDI apps.
I was just thinking if there is a way to ask for features.. and there is! https://bitwish.top/c/features/5
I will add the request for ALSA sequencer devices, which I think should include Jack ones.. but I will investigate this further, as maybe I'm wrong. There is a bridge for sure.
Anyway just don't hijack the MIDI device and be nicer with the linux MIDI ecosystem is a must.