SwiftUI Previews process isolation default changes in Xcode 16 affect memory attribution
SwiftUI Previews execution moved out of the Xcode process with process isolation introduced in Xcode 15 and continued in Xcode 16. The default now runs the preview agent in a separate, restartable process for Swift packages and app targets, which changes where preview memory is attributed. The configuration transition is documented via the PREVIEW_DISABLE_PR
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