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Under iOS 11 and iOS 12, flat RTFD files could be quicklooked using QLPreviewController.Now, under iOS 13, this is no longer the case.Is this deliberate, or is it a known regression? Or just a plain bug?

I tried using QLThumbnailGenerator in Simulator for iOS and iPadOS, but it won't work at all.All I receive is an error:QLUbiquitousItemFetcher: could not create sandbox wrapper. Error: Error Domain=NSPOSIXErrorDomain Code=22 "couldn't issue sandbox extension com.apple.quicklook.readonly for 'path-to-file': Invalid argument" UserInfo={NSDescription=couldn't issue sandbox extension com.apple.quicklook.readonly for 'path-to-file': Invalid argument} #PreviewItemOn the actual device (at least on iPadOS), it works the first time the app is launched, then it doesn't anymore, returning a "The file couldn't be opened" error.Am I doing something wrong, or is this a known issue?All I do is use QLThumbnailGenerationRequest and QLThumbnailGenerator's -generateBestRepresentationForRequest: