I realize, that this is perhaps something which is not relevant for a real game. But during testing with the editor for beginner guys like me it is very difficult to have this problem.
Thank you for the clarification. After digging I found that the error in question is a known issue and has been reported as UE-24831. Unfortunately, I do not have a timeframe of when a fix will be implemented, but I updated the bug report to reflect that additional developers are experiencing this error.