SwiftData crash on new property (Could not cast...)

I have a small example where adding a new property to a persisted Codable struct causes a crash on launch instead of decoding the missing property using its default value.

Steps

Run this app once and press "Insert Event" to persist data:

import SwiftUI
import SwiftData

@main
struct SwiftDataCrash: App {
    var body: some Scene {
        WindowGroup {
            ContentView()
        }
        .modelContainer(for: Event.self)
    }
}

struct ContentView: View {
    @Environment(\.modelContext) private var modelContext
    @Query private var events: [Event]

    var body: some View {
        VStack(spacing: 12) {
            Text("Events: \(events.count)")

            Button("Insert Event") {
                let event = Event(
                    recurrence: Recurrence(
                        interval: 1
                    )
                )

                modelContext.insert(event)
                try? modelContext.save()
            }

            List(events) { event in
                Text(String(describing: event.recurrence))
            }
        }
        .padding()
    }
}

@Model
final class Event {
    var recurrence: Recurrence? = nil

    init(recurrence: Recurrence? = nil) {
        self.recurrence = recurrence
    }
}

struct Recurrence: Codable {
    var interval: Int

    // STEP 2:
    // After first run + inserting an Event, uncomment this and run again.
    // Expected: old data decodes with default []
    // Actual: SwiftData may crash while reading Event.recurrence
    //
    // var exceptionDates: [Date] = []
}

Then uncomment:

var exceptionDates: [Date] = []

and run again without deleting the store.

Actual result

App crashes on launch with:

Could not cast value of type 'Swift.Optional<Any>' to 'Swift.Array<Foundation.Date>'

The crash appears to happen inside generated SwiftData persisted-property getter code.

Expected result

I expected the old persisted Recurrence values to decode with:

exceptionDates == []

Is this expected behavior or a SwiftData bug?