I worked in IT for years, and "it's been that way for years" was one of our forbidden phrases. Bugs can get into your code early and not be discovered for years, so it's never too late to learn about it.
That said, I had this happen to me a couple of times in both D3 and D2 - not often, but enough to make me gun shy about sending HVs/CVs before I contacted the kid. I always figured it was just part of the system. Next time it happens I'll be sure to submit a ticket.