I referred to the code provided in the article Adding and Editing Persistent Data in Your App in the SwiftData documentation and tested the "/PreviewHelper" approach. I found that if a model class contains a property of a struct, and that struct includes a Set property or an Array property, the Preview would throw an error. Here is an example of the model: @Model class Book { // ... var someStruct: SomeStruct // ... } struct SomeStruct: Codable { // ... var someCollection: Set<Int> // ... } In actuality, this model can run and store data without any issues, but it fails to run in the Preview. Is there a problem with the implementation of this Preview or is there any other reason? Are there better ways to perform Preview in SwiftData?