Strange Bug? Arp -> [Generator] -> Freeze Point has a strange problem.

[Jengamon]

I'm getting a weird bug (?) when using a MIDI Arp into any generator plugin (Waveform or other), then freezing the track; the first arp plays, then it's just one note arps until the end, even if the original clip was all dyads. I'm just trying to learn Waveform and this kinda throws a wrench in that plan.

I've tried switching experimental Engines and re-freezing, and even turning experimental off, but the problem persists.

Any help would be appreciated.