I downloaded and built the Learning App based on resource files of “IOS Databases (SwiftUI) - Module 2 - Lesson 4”. After running the App on Iphone 12 simulator, I clicked the first module “Learn Swift”. It shows a list of 10 lessons. I clicked the first lesson “Constants and Varaiables”. It shows the details screen but immediately returns to the parent screen, i.e. the list of 10 lessons. I clicked other lessons and the same issue happened. I try to run the original App in “IOS Foundations (SwiftUI) - Module 5: Learning App”. And it behaved the same.
The App used to work. Don’t know if the Xcode platform or other reasons have caused this problem.