I created a default app and included SwiftData (Xcode 15 Beta 6) - and the app crashes on launch (it worked just fine on iOS Beta 5 and it still works when I target my Mac (Designed for iPad) and my simulator (which is still Beta 5).
dyld[697]: Symbol not found: _$s9SwiftData6SchemaC12RelationshipC_10deleteRule17minimumModelCount07maximumhI012originalName7inverse12hashModifierAeA15PropertyOptionsCd_AE06DeleteF0OSiSgAPSSSgs10AnyKeyPathCSgAQtcfC
Referenced from: <3C3E5688-BD66-3C22-A509-0019AE66F13C> /private/var/containers/Bundle/Application/E1FC46F3-5842-4DFD-8B32-6F263CDFC5FD/GrapeSips.app/GrapeSips
Expected in: <8B52C2B3-931A-3736-B357-ECF87A41F3EB> /System/Library/Frameworks/SwiftData.framework/SwiftData