I had the same issue with Xcode 15 beta 6 and adding the deleteRule: before .cascade + removing the default value fixed it. This should be the accepted answer!

Good to know the enum has to conform to Codable! Nevertheless this isn’t working for me – the enum won’t be persisted when changing in the app.

I don’t get the error, but I have the same issue – the enum won’t be persisted! Filed a feedback as well (FB12362116).

Yep, have seen that on my hunt to get some information somewhere 😉

That should be accepted as answer. This fixed the issue for me as well. PS: You can also right-click the storyboard file, select Open As > Source Code and search and replace right inside of Xcode.

Using Chrome worked for me as well as unfortunately Safari doesn’t seem to support this.