I'm using iOS 11 beta 5. After adding a model version and creating a custom mapping model, the constructor
public init?(from bundles: [Bundle]?, forSourceModel sourceModel: NSManagedObjectModel?, destinationModel: NSManagedObjectModel?)
always returns nil due to a mismatch between the mapping and the source/destination models. I didn't modify any model version after creating the mapping.
Does anyone experience the same issue?