No, I don't need, SwiftData does this for us. I've already mentioned that save() does not help.

I don't think so. The model was not well defined there.

The only solution that works 100% is to remove conformance to Codable. You have to serialise the date in your own different way. The workaround, I described in the post, removes the error message but the issue is still there and it is clearly noticeable when notes are processing in batch mode.