I brought it to their attention about a year ago, I think the verdict was that the arpeggiation starts at the instant you trig the first note, so it hasn’t had time to collect the others, it’s not considered a bug, but I agree it’s annoying, but it’s not an issue sequenced, right! Make peace with it as I don’t think you can ask them to introduce latency on the off chance you hit a chord (and yes I know other instruments do better at this)