This probably was the case in v2.30 already so not beta-specific, just something I ran into again a couple of days ago:
The arpeggio named up/down is actually down/up. Which is as an arpeggio is just the thing when it is, but at other times you really need up/down. It’s such a common thing that it’s omission seems kinda impossible - am I just missing some obvious trick to change the phase? If that’s not the case then the lack of actual up/down arpeggio looks like a bug to me, especially in the contrast to the several far more exotic arpeggio variants added in v2.9x. At any rate the arpeggio name is a somewhat misleading.
Having slept over it, on the beta I suppose you could consolidate the arpeggio onto a track and then shift the whole thing to shift the phase, but then you lose the ability to easily change (still less of a pain than entering every note manually which is what I did, 192 notes with changing chords in a 3/4 signature was a rather painful excercise)