I'm also seeing this. This has been a useful data recovery strategy for us in some support cases, so this capability being out of action is pretty frustrating!
I'm glad I found this thread, I've been able to dig out an older iPad and restore an application container there to proceed.
Orangetronic
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution