When a MBC marks the last item in a MB complete, but doesn’t mark the completion date on the Percent Complete line, there is no way for someone in the unit to know that that merit badge is finished. It doesn’t show up in any reports. If a MBC is using Quick Entry, they are not given the option to put in this date, so they don’t even know that it’s missing.
We have taken to going through each scout’s advancement record and looking for “100%” completions so that we don’t miss anything. Unfortunately, humans miss things, and it seems that each court of honor there is one scout who says that they completed something but didn’t get awarded their badge. Then we go look and sure enough, it’s this same issue again.