Documentbased SwiftData apps Xcode 15->16

Swift
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I kind of hijacked another Swift/SwiftUI posting (sorry!) because of problems with documentbased SwiftData projects - here is the answer in a new thread, just in case someone is running into the same problems.
(link: My recent experiences with Swift and SwiftUI)

What I did:
I tested my Swift/SwiftData apps on a iOS 18 test-device, before updating all my production devices. My MacBook was on macOS 14 while testing.

Results:
While every SwiftData app (with/without iCloud Sync) worked perfectly, none of the documentbased SwiftData apps did run. There was just a white screen, no action possible. For testing, I have an older iPad, updated to iOS 18.

Solution:
The solution is really easy: Just deploy the apps with Xcode 16 and all documentbased apps I tested are fine!

I finally got an older MacBook that I could update to Sequoia, installed Xcode 16, attached the test-device - and voila!

I was really afraid because I found blog-posting saying things like ‘unless You’re very happy, there might/will be issues after updating…’. I have 3 important (for me) documentbased apps and I re-created 2 of them as ‘normal’ SwiftData apps, just in case.

Due to some other (FileMaker) projects I have to support, I could not update my MacBook to Sequoia earlier

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If one’s retired, does not mean that one has more time…

Due to several projects, I found the time to update all of my iOS devices some days ago

→ The solution for my document-based Swift/SwiftUI application turned out to be that simple (Why did I get no answer from the Apple forums?):

→ just update Your devices, after updating, ALL of my document-based app’s are working, not one problem (beside of the app-icon color). The updater does so many things behind the scenes..

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makes me wonder what they broke along the way that messed them up that the update fixed