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Facing new behavior and issues with my Mac Catalyst document-based app on macOS Big Sur 11.1 run on Intel processor. A. Getting some new "Focus system enabled" and many "Focus system disabled" messages. Does anyone know what these messages are about? B. But even worse after getting the following message: "Did present bridged document browser". Actually did not see that before. Does anyone know what this message is about? Error: The first "Did present Bridget document browser" message appears when presenting the UIDocumentBrowserViewController, which maybe makes sense. After selecting and loading the document and transitioning to the document controller, the document content appears in the view. All fine so far. But then immediately the same message appears again and the view with the document disappears (without viewWillDisappear or anything) and the UIDocumentBrowserViewController is shown again. Hence it is not possible to open and update an existing document anymore! The creation of a new document is still possible and works fine. Error: When opening a document from the Finder (outside the app), a "Save" window appears, which never did before. If you click "Save", it tells you that the file already exists and if you want to replace it. If you click "Replace", the document import fails with the alert message that the document can not be copied, because an item with the same name already exists. Hence it's not possible to open and update an existing document using the same name anymore! Except for macOS Big Sur 11.1 the app runs fine on all platforms and versions: macOS 10.15.7, iPadOS 14.3, iOS 14.3. Using Xcode 12.3.