I have the same problem and give a little more information:
Despite the fact that Xcode gives the "Allow Denial" error, it exports two files to the xcappdata file and does not even export the Documents folder.
AppDataInfo.plist com.apple.PeoplePicker.plist
Then I uninstalled the application and all the data from the device and reinstalled it using Xcode. I exported the data after starting the application and creating a log (the log is saved in the documents folder). This new log file was correctly exported to the Documents folder, but Xcode still generated an Allow Failure error.
After the application was further launched and the logs were created, an attempt to export new data led to an identical export as the first export after reinstallation.
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