I had the same problem and this worked for me. /// - Experiment: try await Task.sleep(for: .milliseconds(100)) DispatchQueue.main.async { modelContext.insert(location) try? modelContext.save() }

I am having a quite a time getting my implementation running as well. About 30 hours in and have watched WWDC2014 #513 many times 🫣. I think David mentioned the grouping of the NAL blocks in the session.