If an actor has a custom event that can be called in the editor and that event is then overridden by a child blueprint, both events will show up in the details panel. The issue is that these two events cannot be told apart. Some suggestions may include: different colors for child and parent events, different labels, different sections of the details panel.
Result: There will be two button available for calling events in the editor that will be indistinguishable from one another (one parent and one overridden child event)
There's no existing public thread on this issue, so head over toAnswerHub just mention UE-73008 in the post.