Release notes when MIDI device disconnected

[1j01]

I don't know exactly in what situation this occurred, maybe I powered off the keyboard while holding notes as a sharp casual end to playing - probably that should reproduce - anyways this is what happens currently, the notes stay held:

Related: should probably release held notes when exporting MIDI (at least, treat it as releasing the notes, i.e. include note-offs) - some DAWs will probably leave the notes held when the MIDI clip ends, which, whilst not incorrect, is probably not what you want.