I was able to reproduce this behavior in UE4.12 and have entered the following bug report: UE-32209. However, I see you described this was an “Age old bug,” but I was not able to reproduce this in previous versions of the engine. This may be because I had already expanded, closed, and expanded the field in UE4.12…
Let me know if you were experiencing this in earlier versions of the engine and I’ll retest.