I'm getting same issue on Beta 5 and Beta 7 dyld[2154]: Symbol not found: _$s9SwiftData6SchemaC16PropertyMetadataVMa Referenced from: <63D43BAC-0413-3988-80E5-4FA0F5F6F46D> /Users/XXXX/Library/Developer/Xcode/DerivedData/APPNAME-fgavhbuultkkgvatnbksrrvzqdgr/Build/Products/Debug/APPNAME.app/Contents/MacOS/ThaiGF Expected in: <324ADC23-74A0-38CA-A9F5-F58F94784E31> /System/Library/Frameworks/SwiftData.framework/Versions/A/SwiftData

If you upgrade to Sonomo 14.0 Beta (23A5328b) it fixes the problem

I'm getting this also on Sequoia beta 15.1 and iOS 18 simulator. Its totally unusable as soon as any web view opens