So are you suggesting that everyone who wants an overlay that works across sheets and the rest of the app should just wait for Apple to add a proper SwiftUI solution based on developer feedback? That may never happen, as we have seen before, and even if it did, it would almost certainly not be available on older OS versions. Is there any realistic chance that SwiftUI will get a clean alternative to the current hacky passthrough UIWindow approach?

Sorry about the delayed response, I hadn't noticed the reply. I've created a sample project on GitHub that demonstrates exactly what's happening with the Staged Migrations warning: Sample project The project reproduces the warnings consistently when performing Core Data save operations for the first time. In my main project the warnings are produced multiple times from one part of the app, but I haven't figured out what the cause is.