Ah, interesting… I have a feature request for this as the wisdom of the crowd suggested it was that (as opposed to a bug). But now I see it was down as a bug after all.
I spent a while looking at this - for midi automation data (as opposed to midi part data) while midi-midi track works, and instrument-instrument track works, instrument-midi and vice versa doesn’t work. Confused? Read more and +1 the feature request here: