This issue has been closed as 'Won't Fix' due to an extended period of time without updates. If this issue is important to you please let us know by posting on the AnswerHub or UDN, and Epic will re-open the ticket for further review.
Opening the Reference Viewer for a level then right clicking on the level and selecting List Referenced Objects displays a message prompt stating "Object 'LevelName' doesn't refer to any non-ignored objects rather than listing the assets that the level references.
Is it a regression?
No - This issue also occurs in 4.10.4
Result:
Newly added blueprint doesn't show up in level reference viewer
Expected:
Assets that the level references appear in new dialog window.
Repro Rate:
3/3
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-28983 in the post.