Xcode 9.2 UIDocumentBrowserViewController: Failed to create bookmark bookmarkString URL

Question

Update: Xcode 9.3 beta fixed it.

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When creating a UIDocument file in a UIDocumentBrowserViewController

[default] [ERROR] Failed to resolve bookmark. Error: Domain Error = NSFileProviderInternalErrorDomain Code = 1 "The reader is not allowed to access the URL." UserInfo = {NSLocalizedDescription = The reader is not allowed to access the URL.}

[DocumentManager] Failed to create bookmark bookmarkString URL (Error Domain = NSFileProviderInternalErrorDomain Code = 1 "Reader is not allowed to access the URL." UserInfo = {NSLocalizedDescription = The reader is not allowed to access the URL.})

The code works well in Xcode 9.1, but does not work in Xcode 9.2. almost the same code as wwdc 2017.

 func documentBrowser(_ controller: UIDocumentBrowserViewController, didRequestDocumentCreationWithHandler importHandler: @escaping (URL?, UIDocumentBrowserViewController.ImportMode) -> Void) { let newDocumentURL: URL? = R.file.templateDocument() // Set the URL for the new document here. Optionally, you can present a template chooser before calling the importHandler. // Make sure the importHandler is always called, even if the user cancels the creation request. if newDocumentURL != nil { importHandler(newDocumentURL, .copy) } else { importHandler(nil, .none) } }