Thank you! This was the ticket.

@OlKir1143 So is it the iPhone side that has an issue? I'm just hoping I don't have to spend 3 hours downgrading my watch to iOS 16 and then upgrading again :) An update on my testing - after deleting the app off both devices (The simple test app I created) and reinstalling, the issue reappeared. So I submitted a radar with the example project. But if this is just an issue lingering from a prior beta install, maybe it isn't reproducible without upgrading from each beta...