I'm also seeing this issue... uninstall Xcode beta and reinstall had no effect on the error. If I navigate in finder I can see there is no swiftdata.frameworks/ installed on the machine.
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the SwiftData Framework is not getting installed probably. there's another thread https://developer.apple.com/forums/thread/734970 where several folks have the same issue. on my machine there is no framework being installed even after I uninstall and reinstall Xcode beta.