Maybe it's silly and not related with your issue but I had troubles previewing AppKit controllers too. I solved it by marking the #Preview with an @available statement. Like so:
@available(macOS 14, *)
#Preview {
let controller = SettingsGeneralViewController()
return controller
}
Without @available the preview keeps crashing. Maybe it's just me but I think this check should be done automatically...
tommasongr
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Same problem here