I ran into the same error after updating to Xcode 13.3, however I never haver had a relevant "Document Types" or "Exported Type Identifiers" for my UIDocument. I found I was able to get around the problem by overriding "fileType" and "savingFileType". I'm not sure what is making use of these values as the document filename appears to be the same.
Topic:
UI Frameworks
SubTopic:
UIKit
Tags: