I found the same thing... breaks in the simulator, but runs well on a device.

I tried adding those print statements to onAppear and onDisappear for the view that was being navigated to, but neither printed.

In this case, it might be that you are using the same variable twice. That could mean you are activating isPresented from 2 locations in your code. If you change your code to use 2 separate variables, it shouldn't crash. For example, use $showView3FromView1 and $showView3FromView2 in their respective views.