If a user has a project open more than once, they will be given an error message when trying to save changes. This message could be more clear as to what issue has occurred.
Result: A popup message is given (Example: The asset "/Game/Untitled" (Untitled.umap) failed to save[Image Removed] (see attached image for example)
Expected: A more clear message would be given, letting the user know they should make sure that they do not have more than once instance of the editor open and then to try again
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-74827 in the post.