Thanks for trying . I’m not really sure how to take a screenshot of the issue. In the perspective viewport it just looks like the blueprint actor in question (albeit overlapping) and in the World Outliner it looks like my other screenshot.
I’m gonna try moving to 4.18 see and see if I can reproduce it. My running guess is that when a blueprint breaks because of bad blueprints, which can happen time to time while working on them, it can orphan these child blueprint actors. But again, the reason this is so annoying is its not easily repro’d.