I am experiencing this issue as well. When I try to run on 16.0, I receive this error: Symbol not found: _UIAccessibilityTraitToggleButton. We do use the toggleButton accessibility trait, but it is always wrapped in a if #available(iOS 17, *). The app is successfully building, so I think that means the code is correct. I get the error on runtime, so I'm wondering if this is a beta issue (I'm on Xcode 26 beta 5). Maybe the #available flag is being ignored?

I've submitted a ticket for my instance of the issue: FB19445364 (iOS 16 Simulators crash due to iOS 17 symbols - Xcode 26 beta 5)

Moved my feedback ticket to FB19548156 (iOS 16 Simulators crash due to iOS 17 symbols - Xcode 26 beta 5)

My issue with iOS 15/16 was resolved with the Xcode 26 beta 6, although a similar issue persists on visionOS 2.0