same issue. An app runs fine on iOS 17 but crashes on iOS 12.4. This occurs even in a completely newly created project.

This solution works for me. https://developer.apple.com/forums/thread/738317 I was able to fix the problem. On XCODE 15 go to: Targets -> Build Settings -> Linking General -> Other Linker Flags Add: -ld_classic It will compile and work on IOS 12