I am facing the same issue, this was working perfectly fine for me in Xcode 15.0.1, I just tested my app using Xcode 15.2 Beta and I'm getting Thread 1: EXC_BAD_ACCESS (code=1, address=0x0) on the same line where I try to create a model container ModelContainer(...) looks like a regression to me. I would open a Feedback

Here is an image of the crash I'm getting on app launch. A few things I've tried with no luck: Removing Migration Plan, this has no effect and the issue is still there Removing the model container when setting up the app, has no effect and the issue is still there I'm convinced this is linked to using non-default types like Date with transformable. Since I've tested out a project where I have a Date as a transformable property, this doesn't crash. But if I use something from UIKit or my own custom type it crashes.

I'm also getting this crash as well on iOS18 simulators in Xcode 16 b4 but not on iOS17 simulators, it looks related to deleting a object from within a context menu I've opened up a feedback with the attached project FB14672741