SwiftData ignore changes on App Intents

Hello everyone, Xcode 16.0 SwiftData project. CloudKit. WidgetConfigurationIntent.

For some reason, I see a really weird behavior.

I have a shared ModelContainer and an interactive widget where I update the model data through an app intent.

This is my model -

@MainActor
class ItemsContainer {
    static let shared = ItemsContainer()
    var sharedModelContainer: ModelContainer!
    
    init() {
        self.sharedModelContainer = container()
    }
    
    func container() -> ModelContainer? {
        if let sharedModelContainer {
            return sharedModelContainer
        }

        let schema = Schema([
            Session.self,
        ])
        let modelConfiguration: ModelConfiguration
        modelConfiguration = ModelConfiguration(schema: schema, isStoredInMemoryOnly: false, cloudKitDatabase: .automatic)

        do {
            let container = try ModelContainer(for: schema, configurations: [modelConfiguration])
            self.sharedModelContainer = container
            return container
        } catch {
            fatalError("Could not create ModelContainer: \(error)")
        }
    }
}

And this is how I get the model context across the app and the app intent -

        let modelContext = ModelContext(ItemsContainer.shared.sharedModelContainer)

The problem is that somehow, when I update the model context in the app and then in the widget (I save the context after every change), the data is synced between the app and the widget, but then, the data is changed back to the previous state and kind of ignores the widget changes.

Didn't happen before iOS 18/Xcode 16.

Any idea?

Thanks a lot!